皱皮木瓜果实发育后期品质变化及其成熟阶段的划分初探

以湖北长阳产皱皮木瓜为材料,测定果实发育后期果实鲜质量、果长、果径、果色、果实硬度以及果肉干物质量、可溶性糖含量、总酸含量和总黄酮含量等品质指标的动态变化,划分不同成熟阶段,为判断果实适宜采收期、实现优质生产提供理论参考。结果表明:(1)皱皮木瓜果实发育后期果实鲜质量、果长、果径、果肉干物质量和可溶性糖含量均呈现上升趋势;果色由绿色、黄绿色渐变为淡黄色到黄色;果实硬度、果肉总酸和总黄酮含量呈先上升后下降趋势。(2)各品质指标快速变化的时间区域存在差异,果实鲜质量在花后105~150d增加较快,果色在150d后逐渐变黄,果实硬度在花后135~165d快速下降,果肉总酸、总黄酮含量则在花后105~120d快速增加至峰值。(3)根据主成分分析结果和各品质指标的变化特点,可初步将皱皮木瓜果实发育后期划分为未成熟(花后105d之前)、早期成熟(花后120~150d)和成熟(花后165~180d)3个阶段。研究表明,随着果实成熟度的提高,皱皮木瓜果实鲜质量、果色、果肉干物质量、可溶性糖含量等指标不断升高,果实硬度逐渐下降,其食用加工品质不断提升,而在早期成熟阶段(花后120~150d)果实的药用品质则相对较高。     

壳聚糖对不结球白菜营养品质和某些农艺性状的影响

0.4～0.6mg·g~(-1)(种子)和20～40μg·mL~(-1)浓度范围内壳聚糖拌种及喷叶处理都能提高不结球白菜叶片中可溶性蛋白、总氨基酸、可溶性总糖、维生素C以及总叶绿素含量,降低粗纤维含量,从而改善不结球白菜的营养品质,同时不结球白菜的单株总鲜重、株高、最大叶面积、根鲜重以及根长也有增加。     

罗汉果果实生长发育与内含物变化的研究

罗汉果开花授粉后果实体积不断地增大。纵径在授粉后1至3天生长最快,以后逐渐减慢:横径以授粉后9至15天生长最快,30天果实体积停止增长。果实生长发育过程中,干物质含量由低到高变化,总糖含量由低到高不断增加,但还原糖与非还原糖含量的变化有所不同,维生素C含量在生长发育前期最高,随果实发育,其含量逐渐下降。     

不同贮藏温度对软枣猕猴桃‘猕枣1号’果实品质和贮藏性的影响

为了探究不同贮藏温度对软枣猕猴桃(Actinidia arguta(Sieb.&Zucc.) Planch. ex Miq.)品种‘猕枣1号’采后生理、品质和贮藏性的影响,比较分析了‘猕枣1号’果实在常温贮藏(20℃,85%相对湿度)和低温贮藏(1.5℃,90%相对湿度)过程中果实硬度、无损压力硬度、可溶性固形物、失重率、可溶性总糖、总酸和维生素C等指标的变化,同时对低温贮藏6周结束时和转入20℃货架期3 d后的果实贮藏病害进行了评价。结果显示,贮藏温度对果实软化和贮藏期限、失重率、内在品质均有较大影响。在20℃贮藏过程中,果实软化较快,贮藏7 d后果实可食,贮藏12 d后果实过熟;果实失重率和可溶性总糖含量均随贮藏时间的延长而逐渐增加,至12 d时分别达到7.17%和9.60%;而总酸和维生素C含量在贮藏前期基本稳定。在1.5℃贮藏过程中,果实软化较慢,至贮藏4周后才开始快速软化,至6周时果实硬度仍有4.60 N,但是20℃货架3 d后果实过熟;果实日失重速率远低于常温贮藏,以致于贮藏6周后果实失重率仅为3.0%;可溶性总糖变化与常温下相似,但货架结束后的总糖含量(10.73...     

遮光对刺梨果实和叶片中维生素C与糖含量以及相关酶活性的影响

为探究光照强度减弱对不同发育期的刺梨(Rosa roxburghii Tratt.)果实和叶片中维生素C与糖含量及相关酶活性的影响,以‘贵农5号’刺梨扦插苗为材料,采用遮阳网设置光强减弱20%、40%、60%的3个遮光处理,以自然光照强度为对照(CK),分析不同光照强度条件下刺梨果实和叶片中维生素C含量及相关酶活性以及糖含量的变化。结果表明：(1)光照强度减弱后,不同发育期的刺梨果实和叶片中维生素C含量均显著降低,对照及3个处理间的果实维生素C含量的差异在快速膨大期均达到显著水平。(2)随着光照强度的减弱,刺梨果实和叶片中L 半乳糖 1,4 内酯脱氢酶(GalLDH)、单脱氢抗坏血酸还原酶(MDHAR)和脱氢抗坏血酸还原酶(DHAR)活性均降低,而抗坏血酸氧化酶(AAO)和抗坏血酸过氧化物酶(APX)活性均增强,尤其是果实中MDHAR活性在快速膨大期迅速大幅增强。(3)刺梨果实和叶片中可溶性糖、蔗糖、葡萄糖、果糖含量随光照强度减弱而降低,但果实中葡萄糖含量在快速膨大期增加尤为迅速。(4)果实中维生素C含量与叶片中蔗糖、葡萄糖含量在不同发育期均呈极显著正相关关系,快速膨大期果实中GalLDH、MDHAR活性与维生素C含量呈极显著正相关关系且相关系数均达到最大值,而其APX活性与维生素C含量呈极显著负相关关系且相关系数达到最大值。研究认为,光照强度通过调控刺梨果实中维生素C合成及相关代谢关键酶的活性与叶片中光合产物的含量最终影响果实中维生素C的积累量;弱光环境不利于刺梨果实和叶片中维生素C及糖的积累,其影响在果实快速膨大期尤为明显;良好的光照是保证刺梨果实优良品质的基本条件。     

基于熵权TOPSIS模型的桃儿七种子超低温保存条件筛选

探索适宜桃儿七（Sinopodophyllum hexandrum）种子超低温保存的条件,为桃儿七种子的长期保存提供技术支撑。以桃儿七种子为试验材料,利用硅胶干燥法、自然阴干法及浸泡法获取1.6%、9.6%、20.9%、30.5%的4种不同含水量种子,并通过直接冷冻、缓慢冷冻及玻璃化冷冻3种方式对其进行超低温保存,同时测定超低温保存前后桃儿七种子生活力及其种子内超氧化物歧化酶（SOD）、过氧化物酶（POD）、丙二醛（MDA）、总蛋白（TP）、可溶性淀粉、可溶性糖的含量变化。研究结果发现：(1)不同含水量的桃儿七种子经3种超低温冷冻方式保存后,种子生活力均呈现不同程度的下降,但含水量为1.6%、9.6%和20.9%的桃儿七种子经缓慢冷冻后较对照组无显著差异（P>0.05）;(2)4种含水量的桃儿七种子经超低温保存后,其种子内可溶性糖和总蛋白含量总体呈上升趋势,且可溶性糖含量增幅最大,而种子内淀粉含量、超氧化物歧化酶和过氧化物酶活性总体呈下降趋势,但超氧化物歧化酶和过氧化物酶活性在含水量为1.6%和9.6%时降幅较小,丙二醛含量在含水量为1.6%和30.5%时呈上升趋势,而在含水量为...     

不同甜樱桃品种果实主要内含物测试与分析

以 拉宾斯 、 斯坦勒 等7个生产上主栽的欧洲甜樱桃品种为试验材料,研究了不同品种采收后果实可溶性蛋白质、维生素C Vc 、可溶性总糖和总酸等主要内含物含量的差异.进一步分析了各主要内含物含量与果实发育期、果实大小以及相互之间的相关性.结果表明:甜樱桃品种果实可溶性蛋白质和总糖含量与果实发育期均呈显著正相关,说明发育期短的早熟品种果实可溶性蛋白质和糖含量显著低于果实发育期长的中、晚熟品种 P<0.05 ;甜樱桃品质标准在 中上 级以上,果实的可溶性蛋白质含量范围在1052.0～1119.3mg·100g-1FW;品质在 中上 标准以上的果实维生素C的含量范围在9.89～18.01mg·100g-1FW;7个甜樱桃品种之间果实总酸度差异显著 P<0.05 ;甜樱桃果实的糖酸比值与果实发育期和可溶性糖含量均呈显著正相关,甜樱桃果实的糖酸比值能确切地反映果实风味及品质的优劣,可以作为一项指标,甜樱桃品质在 中上 标准以上的果实糖酸比范围在31.37～40.54;早、中、晚熟品种之间相比较,甜樱桃早熟品种的果实大小显著低于中、晚熟品种 P<0.05 .     

人工老化处理对结球甘蓝种子生理生化特性的影响

以结球甘蓝品种‘冬升’种子为材料,研究高温(40℃)高湿(相对湿度100%)人工老化处理过程中种子的萌发特性、种子浸出液相对电导率和丙二醛、可溶性蛋白、可溶性糖含量以及抗氧化酶活性的变化,以揭示种子劣变的机理。结果表明:(1)人工老化处理甘蓝种子的含水量和不正常苗率均随着老化时间的延长逐渐增加,而种子发芽势、发芽率、发芽指数和活力指数的增加均逐渐降低。(2)随着处理天数的延长,老化处理甘蓝种子的浸出液电导率显著增大,浸出液可溶性糖含量逐渐升高,可溶性蛋白含量表现出显著下降趋势,而种子MDA含量呈先升高后逐渐下降的趋势。(3)在结球甘蓝种子老化进程中,其种子中SOD、POD、CAT活性变化的趋势相似,均随老化程度的加深而逐渐降低;而APX活性在老化处理的最初2d显著增加,第6天显著降低。研究发现,在结球甘蓝种子老化进程中,种子活力和萌发率显著降低,其种子浸出液电导率、可溶性蛋白含量、可溶性糖含量、保护酶活性变化与种子老化及劣变程度密切相关,膜脂过氧化作用可能是引起或加剧种子老化劣变的重要原因之一。     

模拟四季温度层积对南方红豆杉种子生理性状的影响

为了解濒危物种南方红豆杉(Taxus chinensis var. mairei)种子内含物含量受温度和湿度层积的影响,设置4个季节、2种湿度(16%和24%)基质层积处理,对种子的可溶性糖、淀粉、可溶性蛋白和脂肪等内含物质的变化进行研究。结果表明,不同层积处理下种子贮藏物质的含量有显著变化,春季层积9个月后,可溶性蛋白含量达到最高值;可溶性糖含量呈现降低-升高-降低的变化趋势;淀粉和脂肪含量均随层积逐渐减少。秋季层积9个月后,淀粉含量降至最低。相比于24%湿度,16%湿度的春季、秋季、冬季层积9个月后,脂肪含量均减少较多,说明16%湿度下种子代谢活动更强。春季和秋季的暖温更能促进种子代谢,促进种子形态后熟。夏季温度过高,导致种子生活力下降,夏季层积处理3个月后,种子已经发霉和腐烂。层积过程中,种子内含物在相关酶的作用下,降解为可溶性蛋白、可溶性糖等,为种子萌发提供物质与能量。种子层积时间、温度和湿度及交互作用可作为种子内含物的调控因子。     

人工疏果对黄皮果实品质及部分内源激素含量的影响

以'大鸡心'黄皮为材料,研究了不同程度人工疏果对黄皮果实品质及内源激素含量的影响.结果表明:与对照相比,疏果50%和25%后,黄皮果实中可溶性糖、维生素C、可食率等显著提高,可滴定酸含量显著降低;疏果50%和疏果25%后,黄皮果实种子及果皮的IAA、GA3、ZT含量增加,ABA含量降低.实验表明,人工疏果可以提高黄皮果实的品质,提高果实内促进生长类激素含量、降低抑制生长类激素含量.     

云南黑老虎不同种源氨基酸和其他指标的分析与评价

为探讨黑老虎（Kadsura coccinea ）作为果用食物的营养价值,对采自云南省不同产地的野生黑老虎果实分别测定其果皮和果肉中的维生素 C、可溶性固形物、氨基酸、粗纤维、蛋白质、总糖等含量,并进行比较分析。结果表明：野生黑老虎果实含有丰富的人体必需的氨基酸,4个种源中,以勐海的黑老虎果肉中各人体必需氨基酸总含量最高,为0．256％,其次是屏边种源,为0．106％,景东种源为0．0943％,普文种源氨基酸总含量最少,为0．0274％。黑老虎果实还含丰富的维生素 C、粗纤维、蛋白质、总糖等。不同产地之间或单株之间各营养指标变化范围大,变异系数较高,优良种源或优良单株可选择性较强。果肉的养分灰关联度以勐海种源和第2单株最高,将作为备选优良种源和优良单株。     

丛枝菌根真菌对盐胁迫下黄瓜植株生长、果实产量和品质的影响

采用有机基质栽培,选用盐敏感黄瓜品种‘津春2号’为试验材料,研究了丛枝菌根真菌(AMF)对盐胁迫下黄瓜植株生长、矿质营养吸收、果实品质和产量的影响.结果表明：接种AMF可以有效促进黄瓜植株生长和对矿质营养的吸收,提高果实产量和改善蔬菜营养品质;盐胁迫下,黄瓜生长受到抑制,植株体内N、P、K、Cu、Zn含量减少和K⁺/Na⁺降低,果实产量和可溶性蛋白、总糖、Vc、硝酸盐含量下降;接种AMF可缓解盐胁迫对黄瓜生长的抑制作用,使植株体内N、P、K、Cu和Zn含量分别比对照提高7.3%、11.7%、28.2%、13.5%和9.9%,K⁺/Na⁺、果实产量、可溶性蛋白、总糖、Vc含量明显提高,果实硝酸盐含量显著降低.表明AMF可通过促进盐胁迫下黄瓜植株对矿质营养的吸收,促进植株生长,增强植株对盐胁迫的耐性,进而提高其产量和改善营养品质.     

Sucrose accumulation in developing peach fruit

Uptake of ¹⁴C-sugars and activities of sucrose metabolizing enzymes were determined in order to study the mechanism(s) of sucrose accumulation in developing peach fruit. Mesocarp of young peach fruit contained glucose and fructose but little sucrose. Starting 88 days after anthesis (DAA) the sucrose concentration increased greatly. The mechanism of sucrose accumulation was studied by measuring ¹⁴C-sucrose and ¹⁴C-glucose uptake rates at three different stages of fruit development, and by assaying weekly the activity of enzymes involved in the hydrolysis and/or synthesis of the soluble sugars. Uptake of 0.5–100 m M ¹⁴C-sucrose and ¹⁴C-glucose by mesocarp tissue slices showed a complex pattern at the first stage of fruit development (62 DAA). During the subsequent growth stages the pattern of sugar uptake changed and was approximately monophasic at the third stage of fruit development.
At 10 m M , glucose was taken up more rapidly than sucrose at the first and second stage of fruit development. Uptake was partially inhibited by the uncoupler carbonylcyanide m -chlorophenylhydrazone (CCCP) at 25 μ M. These results, together with the presence of a putative extracellular invertase, suggest an apoplastic route for sucrose uptake which is dependent, at least in part, on energy supply.
Activities of sucrose hydrolyzing enzymes (insoluble acid invertase, soluble acid invertase, neutral invertase, sucrose synthase) were high in young fruits and declined sharply with fruit development concomitantly with accumulation of sucrose. The storage of the sugar was not accompanied by a rise in synthetic activities (sucrose synthase, sucrose phosphate synthase), suggesting that sucrose could, at least in part enter the carbohydrate pool directly.     

The cellular pathway of postphloem sugar transport in developing tomato fruit

The cellular pathway of postphloem sugar transport was elucidated in the outer pericarp of tomato (Lycopersicon esculentum Mill cv. Floradade) fruit at 13–14 and 23–25 days after anthesis (DAA). These developmental stages are characterized by phloem-imported sugars being accumulated as starch and hexose, respectively. The symplasmic tracer, 5(6)-carboxyfluorescein, loaded into the storage parenchyma cells of pericarp discs, moved readily in the younger fruit but was immobile in fruit at 23–25 DAA. Symplasmic mobility of [¹⁴C]glucose was found to be identical to 5(6)-carboxyfluorescein. For the older fruit, the pericarp apoplasm was shown to be freely permeable to the apoplasmic tracer, trisodium 3-hydroxy-5,8,10-pyrenetrisulfonate. Indeed, the transport capacity of the pericarp apoplasm was such that the steady-state rate of in-vitro glucose uptake by pericarp discs accounted fully for the estimated rate of in-vivo glucose accumulation. For fruit at 23–25 DAA, the inhibitory effects of the sulfhydryl group modifier, p-chloromer-curibenzenesulfonic acid (PCMBS), on [¹⁴C]glucose and [¹⁴C]fructose uptake by the pericarp discs depended on the osmolality of the external solution. The inhibition was most pronounced for pericarp discs enriched in storage parenchyma. Consistent with the PCMBS study, strong fluorescent signals were exhibited by the storage parenchyma cells of pericarp discs exposed to the membrane-impermeable thiol-binding fluorochrome, mono-bromotrimethylammoniobimane. The fluorescent weak acid, sulphorhodamine G, was accumulated preferentially by the storage parenchyma cells. Accumulation of sulphorhodamine G was halted by the ATPase inhibitor erythrosin B, suggesting the presence of a plasma-membrane-bound H⁺-ATPase. A linkage between the putative H⁺-ATPase activity and hexose transport was demonstrated by an erythrosin-B inhibition of [¹⁴C]glucose and [¹⁴C]fructose uptake. In contrast, comparable evidence for an energy-coupled hexose porter could not be found in the pericarp of younger fruit at 13–14 DAA. Overall, the data are interpreted to indicate that: (i) The postphloem cellular pathway in the outer fruit pericarp shifts from the symplasm during starch accumulation (13–14 DAA) to the apoplasm for rapid hexose accumulation (23–25 DAA). (ii) An energy-coupled plasma-membrane hexose carrier is expressed specifically in storage parenchyma cells at the latter stage of fruit development.     

Chlorophenoxyacetic acid and chloropyridylphenylurea accelerate translocation of photoassimilates to parthenocarpic and seeded fruits of muskmelon (Cucumis melo)

We compared the effect of p-chlorophenoxyacetic acid (p-CPA) and 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU) on parthenocarpic and seeded muskmelon (Cucumis melo) fruits in regards to fruit development and the transport of photoassimilates from leaves exposed to ¹⁴CO₂ to the developing fruits. Ten days after anthesis (DAA), the fresh weight, total ¹⁴C-radioactivity and contents of ¹⁴C-sucrose and ¹⁴C-fructose were higher in the CPPU-induced parthenocarpic fruits than in seeded fruits. However, at 35 DAA, fresh weight and sucrose content in mesocarp, placenta and empty seeds of the parthenocarpic fruits were lower than in seeded fruits. Also, total ¹⁴C-radioactivity and ¹⁴C-sugar content of the parthenocarpic fruits were lower as well as the translocation rate of ¹⁴C-photoassimilates into these fruits. Application of p-CPA to the parthenocarpic fruits at 10 and 25 DAA increased fresh weight and sugar content. Moreover, these treatments elevated the total ¹⁴C-radioactivity, ¹⁴C-sucrose content and the translocation rate of ¹⁴C-photoassimilates. The ¹⁴C-radioactivity along the translocation pathway from leaf to petiole, stem, lateral shoot and peduncle showed a declining pattern but dramatically increased again in the fruits. These results suggest that the fruit's sink strength was regulated by the seed and enhanced by the application of p-CPA.     

不同发育时期黄皮种子脱水敏感性的研究

自花后４６ｄ到８８ｄ果实成熟．黄皮种子的发芽率由０升至１００％．而活力指数逐渐上升,到花后７４ｄ达到最大值,之后略有下降．每粒种子的呼吸强度在花后４６－６７ｄ持续增加,此后则渐渐减弱,但湿藏２ｄ后又回升．黄皮种子的发育明显超前于果实．花后７４ｄ时．每粒种子的干重已接近最大值,这时种子活力最大．而果实的鲜重虽然已接近最大值．但其干重却只有成熟时的７３％。花后４６－５３ｄ的种子,其发芽率小于１００％,轻微脱水能提高种子的发芽率及活力指数,花后６０ｄ至果实成熟．种子发芽率均为１００％．这时任何程度的脱水都会引起活力指数的下降,但不同发育时期的黄皮种子耐脱水力有差别．其中以花后６７ｄ的耐脱水力最强．花后８８ｄ果实成熟时种子的耐脱水力最弱。     

采收期对‘红心’番石榴品质和耐贮性的影响

以福建漳州栽培的‘红心’番石榴(Psidium guajava ‘Hongxin’)为材料,探究不同采收期对其果实采后耐贮性和品质的影响。实验分盛花期后95 d (采收期Ⅰ)、105 d (采收期Ⅱ)和115 d (采收期Ⅲ) 3个时段进行采收,采后果实在常温(25±1℃) 和相对湿度85%条件下贮藏,贮藏期间测定番石榴果实商品率、失重率、呼吸强度、相对电导率、色调角、硬度、可溶性固形物、可滴定酸、维生素C和总糖含量变化。结果表明,‘红心’番石榴果实采后软化迅速,颜色由绿转黄较快;随着采后贮藏时间的延长,番石榴果实的商品率、硬度、色调角、可滴定酸、维生素C和总糖的含量降低,而果实失重率、细胞膜相对透性增加;采收期Ⅰ较采收期Ⅱ、Ⅲ的耐贮性强。因此,对于‘红心’番石榴果实,考虑贮运期长,适宜在采收期Ⅰ采收;其他两个采收期可在产地销售。     

岩木瓜果实营养成分分析及急性毒性实验

对岩木瓜果实的营养成分及食用的急性毒性进行了测定。结果表明,岩木瓜果实的灰分为6.19%,蛋白质质量分数为2.9%,脂肪质量分数为8.9%,维生素C为162 mg.kg-1,有机酸质量分数为0.48%,可溶性糖为10.1%,矿质元素含量丰富。岩木瓜对小鼠的急性毒性实验表明,岩木瓜无毒,可作为食品开发。     

Factors affecting 'Hass' avocado fruit size: Carbohydrate, abscisic acid and isoprenoid metabolism in normal and phenotypically small fruit

Carbohydrate and abscisic acid (ABA) metabolism were investigated in normal and phenotypically small 'Hass' avocado ( Persea americana Mill.) fruit in an attempt to link alterations in sugar and ABA content with changes in 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR, EC 1.1.1.34) activity and fruit size. The small-fruit phenotype was characterized by reduced seed HMGR activity, increased seed insoluble acid invertase ( β - d -fructofuranosidase, EC 3.2.1.26), decreased sucrose synthase (SS; UDP- d -glucose: d -fructose-2- α -glucosyl-transferase, EC 2.4.1.13) activity, decreased sucrose content, and increased glucose as a proportion of the total soluble sugar. Sucrose phosphate synthase (SPS; UDP- d -glucose: d -fructose 6-phosphate 2- α - d -glucosyltransferase, EC 2.4.1.14) activity was unaffected in seed but reduced in mesocarp of the small fruit. In addition, the small-fruit variant displayed enhanced respiration and both seed and mesocarp tissue showed increased ABA metabolism. Applied ABA caused an increase in insoluble acid invertase activity in seed tissue of normal fruit while mevastatin reduced HMGR activity in this tissue, caused sucrose depletion and increased the proportion of glucose from 5 to 57% of total soluble sugars. Exogenous glucose suppressed HMGR activity in seed tissue whereas in mesocarp tissue, HMGR activity was reduced to 38% of the control after 6 h but enhanced by 46% by 48 h. Glucose increased ABA biosynthesis and turnover in competent tissues. These results suggest that ABA turnover is mediated, in part, by carbohydrate content and composition which also affects HMGR activity. It is proposed that sugar and ABA signals act in concert to modulate expression and/or activity of HMGR in the control of 'Hass' avocado fruit growth and final fruit size.     

p-CPA increases the endogenous IAA content of parthenocarpic muskmelon fruit

We examined the effects of seed formation andpara-chlorophenoxyacetic acid (p-CPA)treatment on the growth and endogenous indole acetic acid (IAA) content ofmuskmelon fruit. The growth of parthenocarpic muskmelon fruit induced by 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU) declined 15 days after anthesis (DAA),resulting in smaller fruit than those pollinated at harvest.p-CPA improved the growth of parthenocarpic fruit thatweretreated between 10 and 25 DAA. Endogenous IAA levels in the seedsof artificially pollinated fruit were at their highest at 10 DAA,then decreased, and increased again after 30 to 45 DAA, whereas,the levels in the empty seeds of parthenocarpic fruit were significantly lowerthroughout development. Although endogenous IAA levels in the placenta ofpollinated fruit were lower than those in the seeds, the changing patterns werevery similar to those in the seeds. Endogenous IAA levels in the mesocarp ofpollinated fruit remained lower than those in the placenta throughout fruitgrowth, and the pattern of change was similar to that of the placenta. Levelsinthe seed, placenta and mesocarp of p-CPA-nontreatedparthenocarpic fruit stayed lower than those in pollinated fruit.p-CPA increased the levels of IAA in the seeds, placenta,and mesocarp of parthenocarpic fruit after the first treatment (10DAA) to 15 DAA, while those in the mesocarp increasedsignificantly after the second treatment (25 DAA), but did notincrease in empty seed and placenta.