共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
Role of Abscisic Acid in Seed Dormancy 总被引:17,自引:0,他引:17
Allison R. Kermode 《Journal of Plant Growth Regulation》2005,24(4):319-344
Seed dormancy is an adaptive trait that improves survival of the next generation by optimizing the distribution of germination
over time. The agricultural and forest industries rely on seeds that exhibit high rates of germination and vigorous, synchronous
growth after germination; hence dormancy is sometimes considered an undesirable trait. The forest industry encounters problems
with the pronounced dormancy of some conifer seeds, a feature that can lead to non-uniform germination and poor seedling vigor.
In cereal crops, an optimum balance is most sought after; some dormancy at harvest is favored because it prevents germination
of the physiologically mature grain in the head prior to harvest (that is, preharvest sprouting), a phenomenon that leads
to considerable damage to grain quality and is especially prominent in cool moist environments. The sesquiterpene abscisic
acid (ABA) regulates key events during seed formation, such as the deposition of storage reserves, prevention of precocious
germination, acquisition of desiccation tolerance, and induction of primary dormancy. Its regulatory role is achieved in part
by cross-talk with other hormones and their associated signaling networks, via mechanisms that are largely unknown. Quantitative
genetics and functional genomics approaches will contribute to the elucidation of genes and proteins that control seed dormancy
and germination, including components of the ABA signal transduction pathway. Dynamic changes in ABA biosynthesis and catabolism
elicit hormone-signaling changes that affect downstream gene expression and thereby regulate critical checkpoints at the transitions
from dormancy to germination and from germination to growth. Some of the recent developments in these areas are discussed. 相似文献
4.
5.
6.
7.
8.
9.
The Arabidopsis Abscisic Acid Catabolic Gene CYP707A2 Plays a Key Role in Nitrate Control of Seed Dormancy 下载免费PDF全文
Theodoros Matakiadis Alessandro Alboresi Yusuke Jikumaru Kiyoshi Tatematsu Olivier Pichon Jean-Pierre Renou Yuji Kamiya Eiji Nambara Hoai-Nam Truong 《Plant physiology》2009,149(2):949-960
10.
A.N.M.Rubaiyath Bin Rahman 《植物学报(英文版)》2012,54(9):663-673
Proanthocyanidins (PAs) are the main products of the flavonoid biosynthetic pathway in seeds, but their biological function during seed germination is still unclear. We observed that seed germination is delayed with the increase of exogenous PA concentration in Arabidopsis. A similar inhibitory effect occurred in peeled Brassica napus seeds, which was observed by measuring radicle elongation. Using abscisic acid (ABA), a biosynthetic and metabolic inhibitor, and gene expression analysis by real-time polymerase chain reaction, we found that the inhibitory effect of PAs on seed germination is due to their promotion of ABA via de novo biogenesis, rather than by any inhibition of its degradation. Consistent with the relationship between PA content and ABA accumulation in seeds, PA-deficient mutants maintain a lower level of ABA compared with wild-types during germination. Our data suggest that PA distribution in the seed coat can act as a doorkeeper to seed germination. PA regulation of seed germination is mediated by the ABA signaling pathway. 相似文献
11.
12.
13.
Potato (Solanum tuberosum L. cv Russet Burbank) microtubers generated in vitro from single-node explants contained substantial amounts (approximately 250 pmol/g fresh weight) of free abscisic acid (ABA) and were completely dormant for a minimum of 12 weeks. Microtubers that developed in the presence of 10 [mu]M fluridone (FLD) contained considerably reduced amounts (approximately 5-25 pmol/g fresh weight) of free ABA and exhibited a precocious loss of dormancy. Inclusion of exogenous racemic ABA in the FLD-containing medium suppressed the premature sprouting of these microtubers in a dose-dependent manner. At a concentration of 50 [mu]M, exogenous ABA restored internal ABA levels to control values and completely inhibited FLD-induced precocious sprouting. Exogenous jasmonic acid was ineffective in suppressing FLD-induced sprouting. Application of FLD to preformed, fully dormant microtubers also resulted in a reduction in internal ABA content and precocious sprouting. These results indicate that endogenous ABA is essential for the induction and maintenance of potato microtuber dormancy. 相似文献
14.
脱落酸(ABA)诱导基因表达的调控元件 总被引:4,自引:0,他引:4
本文详细介绍了脱落酸(ABA)诱导诱导基因表达的各种调控元件及各调控元件间的相经作用和关系,综述了近年来对ABA诱导基因表达的调控元件的研究进展。 相似文献
15.
本文详细介绍了脱落酸(ABA)诱导基因表达的各种调控元件及各调控元件间的相互作用和关系。综述了近年来对ABA诱导基因表达的调控元件的研究进展。 相似文献
16.
拟南芥突变体种子休眠与萌发的研究进展 总被引:8,自引:2,他引:8
种子的休眠和萌发是一个复杂的过程,至今尚未能清楚阐明其调控机制。目前已从拟南芥突变体中鉴定了一些与种子萌发和休眠相关的基因,有助于阐明种子休眠和萌发的分子机制。本文综述了拟南芥突变体种子休眠与萌发方面的研究进展。赤霉素是促进种子萌发的主要因素之一,RGL、SPY、GCR、SLY和GAR等基因的表达参与赤霉素对种子萌发的调控。脱落酸与种子休眠有关,ABI1、ABI2、ABI3、ABI4、ABI5、FUS3、LEC、MARD和CIPK等基因参与了脱落酸的调控过程。对3类乙烯反应的突变体(ein、etr和ctr)以及油菜素内酯突变体(det和bri)的研究表明乙烯和油菜素内酯是通过拮抗脱落酸而促进种子萌发的。光对种子萌发的调节,是通过具有Ser/Thr蛋白激酶活性的光敏色素PhyA、PhyB、PhyC、PhyD和PhyE,以磷酸化/去磷酸化方式调节其它与萌发相关基因的表达。含氮化合物对种子萌发的促进,可能是以一种依赖一氧化氮的方式解除种子休眠。 相似文献
17.
18.
种子的休眠和萌发是一个复杂的过程, 至今尚未能清楚阐明其调控机制。目前已从拟南芥突变体中鉴定了一些与种子萌发和休眠相关的基因, 有助于阐明种子休眠和萌发的分子机制。本文综述了拟南芥突变体种子休眠与萌发方面的研究进展。赤霉素是促进种子萌发的主要因素之一, RGL、SPY、GCR、SLY和GAR等基因的表达参与赤霉素对种子萌发的调控。脱落酸与种子休眠有关, ABI1、ABI2、ABI3、ABI4、ABI5、FUS3、LEC、MARD和CIPK等基因参与了脱落酸的调控过程。对3类乙烯反应的突变体 (ein、etr和ctr) 以及油菜素内酯突变体 (det和bri) 的研究表明乙烯和油菜素内酯是通过拮抗脱落酸而促进种子萌发的。光对种子萌发的调节, 是通过具有Ser/Thr蛋白激酶活性的光敏色素PhyA、PhyB、
PhyC、PhyD和PhyE, 以磷酸化/去磷酸化方式调节其它与萌发相关基因的表达。含氮化合物对种子萌发的促进, 可能是以一种依赖一氧化氮的方式解除种子休眠。 相似文献
19.
Ahammed Golam Jalal Li Yang Cheng Yuan Liu Airong Chen Shuangchen Li Xin 《Journal of Plant Growth Regulation》2020,39(4):1414-1424
Journal of Plant Growth Regulation - Germination is a crucial event in plant lifecycle mediated by a complex hormonal crosstalk. In this study, we revealed an antagonistic interaction between... 相似文献
20.
A series of growth room experiments was carried out aiming to establish the role of abscisic acid on dormancy of Salix viminalis L. The inhibitor content and abscisic acid levels of extracts from roots, sap, leaves, and apical tissues of willow were measured using biological assay and gas-liquid chromatography. 相似文献