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桐花树胎生发育过程中内源性脱落酸、赤霉素和糖分含量的变化
杨盛昌,卢磊,诸姮,李文清
0
(厦门大学环境与生态学院、滨海湿地生态系统教育部重点实验室,福建 厦门 361102;福建省滨海湿地保护与生态恢复工程技术研究中心,福建 厦门 361102)
摘要:
种子胎生是红树植物典型的适应特征之一。本研究以胎生红树植物桐花树(Aegiceras corniculatum)花蕾、种子和胚轴为材料,研究了胎生发育过程中繁殖体内源性脱落酸(ABA)、赤霉素(GA3)、可溶性糖和淀粉含量的动态变化。结果表明:ABA含量在胎生发育过程中呈现先降低后升高的显著变化,即在种子形成前的花蕾期最高\[(1.86±0.07) μg/g\],在种子期达到最低值\[(0.75±0.07) μg/g\],然后随种子萌发逐渐回升;GA3含量则呈现相反的变化趋势,先升高后降低,即在种子期最高\[(12.60±0.05 )μg/g\],然后随种子萌发逐渐降低\[(1.97±0.05) μg/g\];繁殖体可溶性糖含量随发育进程先升高后降低,在种子萌发早期达到最高值;淀粉含量始终呈现增加的趋势,并在种子萌发晚期达到最高值。在胎生过程中,桐花树繁殖器官的内源性ABA和GA3含量以及可溶性糖和淀粉含量的动态变化表明,ABA和GA3通过对糖代谢的综合调控作用可能是红树植物胎生的重要机制之一。
关键词:  海洋生物学  桐花树  胎生  激素  糖分
DOI:10.3969/J.ISSN.2095-4972.2021.04.006
基金项目:国家自然科学基金资助项目(30972334);国家重点研发计划资助项目(2017YFC0506103)
Changes in the contents of endogenous ABA, GA3 and carbohydrates during the vivipary of Aegiceras corniculatum
YANG Shengchang,LU Lei,ZHU Heng,LI Wenqing
(Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 351102, China;Research Centre for Fujian Coastal Wetland Conservation and Ecological Restoration Engineering Technique, Xiamen University, Xiamen 361102, China)
Abstract:
Seed viviparity is one of the adaptative behaviors in mangrove plants. In this paper, the endogenous phytohormone abscisic acid (ABA) and gibberellin (GA3), soluble sugar and starch contents were analyzed in different reproductive organs of viviparous mangrove plant Aegiceras corniculatum. The results indicated that during viviparous development stages, the content of ABA showed a maximum value at the bud stage [(1.86±0.07)μg/g], then decreased and reached a minimum value [(0.75±0.07)μg/g] at the seed stage. The content of ABA gradually increased as seed germinated. GA3 level had a reverse trend of change with ABA level. It’s found that GA3 increased and reached a maximum [(12.60±0.05)μg/g] at the seed stage, then decreased to a minimum [(1.97±0.05)μg/g] at the late seed germinating stage. Soluble sugar content increased firstly and reached the maximum in early seed germinating stage, and then decreased. Starch content was minimum in the bud, then increased gradually and reached a maximum in late seed germinating stage. Change pattern analysis of the endogenous ABA and GA3, soluble sugar and starch contents during different viviparous development stages suggested that GA3 and ABA regulating synergistically the carbohydrate metabolisms may be an important mechanism for the viviparity of mangrove seeds.
Key words:  marine biology  Aegiceras corniculatum  viviparity  phytohormone  carbohydrate

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