不同光质对辣椒叶色黄化突变体光合生理特性的影响研究

以辣椒叶色黄化突变体yl1及其野生型6421为试材，用白光、蓝光、红光、绿光、紫光、黄光和远红光不同光质进行处理，考察其表型、生理及光合特性的变化特征，探究光质对黄叶辣椒植株生长发育的影响。结果显示：(1)蓝光与红光对辣椒幼苗的生长有促进作用，黄光和远红光则会显著抑制幼苗生长，6421生长受不同光质的抑制影响比yl1更大。(2)两个辣椒材料光合色素含量在不同光质下均不同程度降低；6421叶绿素总含量和类胡萝卜素含量在不同光质下均高于yl1,yl1和6421叶片的光合色素含量分别在紫光和黄光下最低。(3)蓝光和绿光能显著提高yl1的净光合速率(P_n),而不同光质处理均显著降低了6421的P_n。(4)紫光处理使yl1的PSⅡ潜在活性(F_v/F_o)和最大光化学效率(F_v/F_m)值均显著降低且显著低于6421,但升高了光化学猝灭系数(qP)和非光化学猝灭系数(NPQ)。(5)蓝光、红光和绿光均能提高辣椒的超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(...

Photosynthetic Characteristics and Physicochemical Properties of Pepper Leaf Yellowing Mutants under Different Light Quality

In order to explore the effect of light quality on the growth and development of yellow-leaf pepper plants, we used pepper leaf yellowing mutant yl1 and its wild type 6421 as test materials and treated with different light qualities (white light, blue light, red light, green light, purple light, yellow light and far red light). The changes of phenotypic, physiological and photosynthetic characteristics were studied. The results showed that: (1) blue light and red light promoted the growth of pepper seedlings, while yellow light and far red light significantly inhibited the growth of seedlings. Compared with yl1, 6421 was more affected by different light qualities. (2) The photosynthetic pigment content of the two pepper materials decreased to varying degrees under different light qualities; the total chlorophyll content and carotenoid content of 6421 were higher than those of yl1 under different light qualities. The photosynthetic pigment content of yl1 and 6421 leaves was the lowest under purple light and yellow light, respectively. (3) Blue and green light could significantly increase the net photosynthetic rate (P_n) of yl1, while different light quality treatments significantly reduced the P_n of 6421. (4) Purple light treatment significantly reduced the PSII potential activity (F_v/F_o) and maximum photochemical efficiency (F_v/F_m) of yl1 and significantly lower than that of 6421, but increased the photochemical quenching coefficient (qP) and non-photochemical quenching coefficient (NPQ) to resist photoinhibition damage. (5) Blue, red and green light can improve the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in pepper, while yellow light is the opposite. In summary, blue light and red light can promote the growth and development of pepper, while yellow light and far red light have a significant inhibitory effect. yl1 has a stronger ability to resist light stress, especially under purple light than 6421.