High K supply avoids Na toxicity and improves photosynthesis by allowing favorable K:Na ratios through the inhibition of Na uptake and transport to the shoots of Jatropha curcas plants

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	High K supply avoids Na toxicity and improves photosynthesis by allowing favorable K:Na ratios through the inhibition of Na uptake and transport to the shoots of Jatropha curcas plants
	Rodrigues, C. R. F.
	2013
Source Publication	Journal of Plant Nutrition and Soil Science
ISSN	1436-8730
Volume	176 Issue:2 Pages:157-164
Abstract	This study assessed the relationships between external K supply and K : Na ratios associated with Na toxicity in Jatropha curcas. Plants were exposed to increasing external K concentrations (6.25, 12.5, 25, 37.5, and 50 mM), combined with 50 mM NaCl in a nutrient solution. Photosynthesis progressively increased as the external K : Na ratios increased up to 0.75. The increase of photosynthesis and plant dry matter correlated positively with K : Na in xylem and leaves. The transport rates of K and Na from roots to xylem and leaves were inversely correlated. These ions presented an antagonistic pattern of accumulation in all organs. Maximum rates of photosynthesis and plant growth occurred with leaf K : Na ratios that ranged from 1.0 to 2.0, indicating that this parameter in leaves might be a good indicator for a favorable K homeostasis under salinity conditions. The higher K affinity and selectivity compared with Na in all organs associated with higher xylem flux and transport to shoots are essential for maintaining adequate K : Na ratios at the whole-plant level. These characteristics, combined with adequate K concentrations, allow J. curcas to sustain high rates of photosynthesis and growth even under toxic NaCl levels.
Document Type	期刊论文
Identifier	https://ir.xtbg.ac.cn/handle/353005/7339
Collection	热带植物资源可持续利用重点实验室特色文献_小桐子相关文献
Recommended Citation GB/T 7714	Rodrigues, C. R. F.. High K supply avoids Na toxicity and improves photosynthesis by allowing favorable K:Na ratios through the inhibition of Na uptake and transport to the shoots of Jatropha curcas plants[J]. Journal of Plant Nutrition and Soil Science,2013,176(2):157-164.
APA	Rodrigues, C. R. F..(2013).High K supply avoids Na toxicity and improves photosynthesis by allowing favorable K:Na ratios through the inhibition of Na uptake and transport to the shoots of Jatropha curcas plants.Journal of Plant Nutrition and Soil Science,176(2),157-164.
MLA	Rodrigues, C. R. F.."High K supply avoids Na toxicity and improves photosynthesis by allowing favorable K:Na ratios through the inhibition of Na uptake and transport to the shoots of Jatropha curcas plants".Journal of Plant Nutrition and Soil Science 176.2(2013):157-164.

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