NDLI: Increased photosynthetic capacity in response to nitrate is correlated with enhanced cytokinin levels in rice cultivar with high responsiveness to nitrogen nutrients

Content Provider	Springer Nature Link
Author	Song, Wenjing Li, Jiao Sun, Huwei Huang, Shuangjie Gong, Xianpo Ma, Qunyu Zhang, Yali Xu, Guohua
Copyright Year	2013
Abstract	Ammonium (NH$_{4}$ $^{+}$) is the preferred nitrogen nutrient over nitrate (NO$_{3}$ $^{–}$) in Oryza sativa L. (rice), but photosynthetic capacity is enhanced by partial NO$_{3}$ $^{–}$ nutrition (PNN). The role of cytokinin in the effects of PNN on photosynthetic capacity is unknown.We investigated effects of PNN on six cytokinin fractions in roots, xylem sap, and leaves and on the expression of eight cytokinin synthesis genes in the roots of Nanguang and Elio rice cultivars. The effect of exogenous cytokinin (6-BA) on leaf growth and photosynthetic activity was examined.Cell expansion and CO$_{2}$ assimilation in the first fully expanded leaf were enhanced by PNN in Nanguang but not in Elio. The concentrations of cytokinins in roots, xylem sap, and leaves of Nanguang increased approximately 25–34 % with PNN compared with sole NH$_{4}$ $^{+}$, but no difference was observed in Elio. Exogenous 6-BA counteracted the effects of sole NH$_{4}$ $^{+}$ on leaf growth and photosynthetic activity in both cultivars. OsIPT3 was the key NO$_{3}$ $^{–}$-responsive cytokinin synthesis gene in cv. Nanguang.High NO$_{3}$ $^{–}$ responsiveness is associated with increased cytokinin synthesis and transport from the root to the leaf and is strongly related to a higher photosynthetic capacity in cv. Nanguang.
Starting Page	981
Ending Page	993
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	373
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-08-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cytokinin Leaf growth Nitrate Photosynthetic capacity Rice Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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