Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species

	Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species
	Gao, Dahai ; Gao, Qian ; Xu, Hai-Yan ; Ma, Fei ; Zhao, Chang-Ming ; Liu, Jian-Quan
刊名	TREES-STRUCTURE AND FUNCTION ; Gao, DH; Gao, Q; Xu, HY; Ma, F; Zhao, CM; Liu, JQ.Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species,TREES-STRUCTURE AND FUNCTION,2009,23(4):717-728
	2009-08-01
英文摘要	Pinus densata is a homoploid hybrid species, originating from P. tabuliformis x P. yunnanensis. The physiological fitness of this natural hybrid compared to its two parental species remains unknown. In this study, we investigated physiological responses of the three species by exposing artificially breed seedlings of each to drought stress lasting 28 days. Our results suggest that, in all three species, drought affected the contents of the plants' chlorophyll, stomatal conductance, TBARS, hydrogen peroxide, and free proline and increased the activities of antioxidant enzymes, including superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), and peroxidase (POD; EC 1.11.1.7). The drought stress also induced significant changes in the activity of ascorbate peroxidase (APX; EC 1.11.1.11), monodehydroascorbate reductase (MDHAR; EC 1.6.5.4), dehydroascorbate reductase (DHAR; EC 1.8.5.1), glutathione reductase (GR; EC 1.6.4.2), and levels of ascorbate and glutathione in the ascorbate-glutathione cycle. The hybrid species P. densata appeared to achieve greater drought tolerance and exhibit hybrid superiority in antioxidant processes and other related physiological traits compared to the two parental species, although a few of the hybrid's measured variables were similar to those of P. tabuliformis. However, P. yunnanensis was more sensitive to drought and appeared to have the lowest resistance to such stress. These physiological differences are largely consistent with the species' habitat preferences, which may reflect their early genetic divergences and niche differentiation. These findings provide important information for management and forest restoration efforts of these species in the future.; Pinus densata is a homoploid hybrid species, originating from P. tabuliformis x P. yunnanensis. The physiological fitness of this natural hybrid compared to its two parental species remains unknown. In this study, we investigated physiological responses of the three species by exposing artificially breed seedlings of each to drought stress lasting 28 days. Our results suggest that, in all three species, drought affected the contents of the plants' chlorophyll, stomatal conductance, TBARS, hydrogen peroxide, and free proline and increased the activities of antioxidant enzymes, including superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT; EC 1.11.1.6), and peroxidase (POD; EC 1.11.1.7). The drought stress also induced significant changes in the activity of ascorbate peroxidase (APX; EC 1.11.1.11), monodehydroascorbate reductase (MDHAR; EC 1.6.5.4), dehydroascorbate reductase (DHAR; EC 1.8.5.1), glutathione reductase (GR; EC 1.6.4.2), and levels of ascorbate and glutathione in the ascorbate-glutathione cycle. The hybrid species P. densata appeared to achieve greater drought tolerance and exhibit hybrid superiority in antioxidant processes and other related physiological traits compared to the two parental species, although a few of the hybrid's measured variables were similar to those of P. tabuliformis. However, P. yunnanensis was more sensitive to drought and appeared to have the lowest resistance to such stress. These physiological differences are largely consistent with the species' habitat preferences, which may reflect their early genetic divergences and niche differentiation. These findings provide important information for management and forest restoration efforts of these species in the future.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn//handle/363003/1844]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Gao, Dahai,Gao, Qian,Xu, Hai-Yan,et al. Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species[J]. TREES-STRUCTURE AND FUNCTION, Gao, DH; Gao, Q; Xu, HY; Ma, F; Zhao, CM; Liu, JQ.Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species,TREES-STRUCTURE AND FUNCTION,2009,23(4):717-728,2009.
APA	Gao, Dahai,Gao, Qian,Xu, Hai-Yan,Ma, Fei,Zhao, Chang-Ming,&Liu, Jian-Quan.(2009).Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species.TREES-STRUCTURE AND FUNCTION.
MLA	Gao, Dahai,et al."Physiological responses to gradual drought stress in the diploid hybrid Pinus densata and its two parental species".TREES-STRUCTURE AND FUNCTION (2009).