摘要
介绍番茄种子发育过程中，种子发芽力和抗脱水力形成，浅休眠和胎萌等现象的基础上，着重讨论了ＧＡ与ＡＢＡ在番茄种子浅休眠形成、抑制胎萌方面的作用以及对渗控处理和发芽过程中种子水分关系、种胚生长、ＤＮＡ复制、胚乳弱化等的生理调控机制。
Based upon the brief description of the germination and dessicationtolerance ability, shallow dormancy and viviparous germination during tomato (Lycopersicum esculentum Mill.) seeds, the physiological mechanism of GA and ABA on the regulation of water relations, embyo growth, DNA replication and endosperm weakening was emphatically discussed. The dormancy that was induced by ABA during development, remained in mature seeds and relieved by using promotors like GA4+7 or prolonged dry storage. Seed precocious and viviparous germination within tomato fruit could be prevented by osmotic environment during maturation. There was no influence of ABA and GA on seed water uptake during imbibiton. Nuclear replication of embryo root tips was promoted resulting in embryo growth at pregermination, and not inhibited by ABA. GA was an indispensable factor to induce the weakening of the mechanical restraint of the endosperm layer opposite to root tip in tomato seed, a prerequisite for germination. Mature seeds during development had no obvious resting period. The shallow dormancy of tomato seeds could be relieved by artificial desiccation and osmotic treatment. In addition, osmotic priming could increase germination rate but shorten life-span of tomato seeds.
出处
《园艺学报》
CAS
CSCD
北大核心
1995年第3期267-271,共5页
Acta Horticulturae Sinica
基金
国家教委留学回国人员启动基金
湖南农业大学青年科学基金以及荷兰农业大学"三明治"奖学金共同资助
