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	Calcium chloride improves photosynthesis and water status in the C-4 succulent xerophyte Haloxylon ammodendron under water deficit
	Kang, Jianjun; Zhao, Wenzhi; Zheng, Ying; Zhang, Dong Mei; Zhou, Hong; Sun, Pengcheng
刊名	PLANT GROWTH REGULATION
	2017-07-01
卷号	82期号:3页码:467-478
关键词	Adaptive mechanism Ca2+ Drought stress Osmotic adjustment Pot trial Succulent xerophyte
ISSN号	0167-6903
DOI	10.1007/s10725-017-0273-4
通讯作者	Zhao, Wenzhi(zhaowzh@lzb.ac.cn)
英文摘要	Our results showed that in addition to sodium (Na+), succulent xerophyte Haloxylon ammodendron was more inclined to absorb and accumulate large amount of calcium (Ca2+) than potassium (K+) as an important osmotica for osmotic adjustment (OA) under arid environments. To further reveal the possible physiological mechanisms of Ca2+ accumulation involved in drought resistance of H. ammodendron, 8-week-old plants were treated with a series concentration of external Ca2+ (calcium chloride, 1 x 10(-4) to 8 x 10(-4) g CaCl2 g(-1) dry soil) by potted sandy soil culture experiments in field. Plants were also subjected to water deficit (30% of field water capacity) in the presence or absence of Ca2+ (4 x 10(-4) g CaCl2 g(-1)dry soil) by potted sand culture experiments in greenhouse. The results showed that 4 x 10(-4) g CaCl2 g(-1) soil resulted in optimal plant growth and effectively mitigated harmful impacts of water deficit on the growth of H. ammodendron, by inducing a significant drop in PB water potential and, concomitantly, increasing PB turgor pressure and chlorophyll concentration resulting in an enhancement of overall plant photosynthetic activity. Furthermore, 4 x 10(-4) g CaCl2 g(-1) soil had no effects on the photosystem II photochemistry, but mitigated the inhibitory effect of water deficit on the activity of photosystem II in H. ammodendron. The contribution of Ca2+ to the total osmotic potential varied from 6.2% in the control to 11.4% in plants subjected to water deficit and, surprisingly, to 21.6% in plants grown in the presence of 4 x 10(-4) g CaCl2 g(-1) soil under water deficit; however, the contribution of K+ significantly decreased from 12.1 to 7.0%. These findings suggest that, under arid environments, H. ammodendron is able to accumulate high concentration of Ca2+ in its PB and use it directly for OA, which was coupled with an improvement in PB hydration and photosynthetic activity.
收录类别	SCI
WOS关键词	ENHANCES DROUGHT RESISTANCE ; ZYGOPHYLLUM-XANTHOXYLUM ; PHOTOSYSTEM-II ; CHLOROPHYLL DEGRADATION ; OSMOTIC ADJUSTMENT ; STIMULATES GROWTH ; OXIDATIVE STRESS ; PROMOTES GROWTH ; SODIUM-CHLORIDE ; NA+
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000403575400011
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557730
专题	寒区旱区环境与工程研究所
通讯作者	Zhao, Wenzhi
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Inland River Basin Ecohydrol, Linze Inland River Basin Res Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Kang, Jianjun,Zhao, Wenzhi,Zheng, Ying,et al. Calcium chloride improves photosynthesis and water status in the C-4 succulent xerophyte Haloxylon ammodendron under water deficit[J]. PLANT GROWTH REGULATION,2017,82(3):467-478.
APA	Kang, Jianjun,Zhao, Wenzhi,Zheng, Ying,Zhang, Dong Mei,Zhou, Hong,&Sun, Pengcheng.(2017).Calcium chloride improves photosynthesis and water status in the C-4 succulent xerophyte Haloxylon ammodendron under water deficit.PLANT GROWTH REGULATION,82(3),467-478.
MLA	Kang, Jianjun,et al."Calcium chloride improves photosynthesis and water status in the C-4 succulent xerophyte Haloxylon ammodendron under water deficit".PLANT GROWTH REGULATION 82.3(2017):467-478.

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