Sensitivity to high temperature and water stress in recalcitrant Baccaurea ramiflora seeds

CORC > 西双版纳热带植物园 > 中国科学院西双版纳热带植物园 > 支撑系统

	Sensitivity to high temperature and water stress in recalcitrant Baccaurea ramiflora seeds
	Tan, Yunhong
刊名	JOURNAL OF PLANT RESEARCH
	2016
卷号	129 期号:4 页码:637-645
关键词	High temperature stress Rainforest fragmentation Recalcitrant seeds Seed germination Species shift Water restriction
中文摘要	Southeast Asia experiences one of the highest rates of deforestation in the tropics due to agricultural expansion, logging, habitat fragmentation and urbanization. As tropical rainforests harbour abundant recalcitrant-seeded species, it is important to understand how recalcitrant seeds respond to deforestation and fragmentation. Baccaurea ramiflora is a recalcitrant-seeded species, widely distributed in Southeast Asian tropical rainforest. In this study, B. ramiflora seeds were sown in three plots, one in a nature reserve and two in disturbed holy hill forests, to investigate seed germination and seedling establishment in the field, while laboratory experiments were conducted to investigate the effects of high temperature and water stress on germination. It was found that seed germination and seedling establishment in B. ramiflora were clearly reduced in holy hills compared to the nature reserve, although the seeds were only moderately to minimally recalcitrant. This was potentially caused by increased temperature and decreased moisture in holy hills, for laboratory experiments showed that seed germination was greatly inhibited by temperatures a parts per thousand yen35 A degrees C or water potentials a parts per thousand currency sign-0.5 MPa, and depressed by heat treatment at 40 A degrees C when the continuous heating period lasted for 240 h or daily periodic heating exceeded 10 h. Unlike orthodox seeds, which can endure much higher temperatures in the air-dried state than in the imbibed state, both blotted and immersed B. ramiflora seeds lost viability within a narrow temperature range between 50 and 60 A degrees C. As recalcitrant seeds can be neither air-dried nor heated, species producing recalcitrant seeds will suffer more than those producing orthodox seeds in germination and seedling establishment from increased temperature and decreased moisture in fragmented rainforests, which results in sensitivity of recalcitrant-seeded species to rainforest fragmentation.
公开日期	2016-07-25
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/9978]
专题	西双版纳热带植物园_支撑系统
推荐引用方式 GB/T 7714	Tan, Yunhong. Sensitivity to high temperature and water stress in recalcitrant Baccaurea ramiflora seeds[J]. JOURNAL OF PLANT RESEARCH,2016,129(4):637-645.
APA	Tan, Yunhong.(2016).Sensitivity to high temperature and water stress in recalcitrant Baccaurea ramiflora seeds.JOURNAL OF PLANT RESEARCH,129(4),637-645.
MLA	Tan, Yunhong."Sensitivity to high temperature and water stress in recalcitrant Baccaurea ramiflora seeds".JOURNAL OF PLANT RESEARCH 129.4(2016):637-645.