NDLI: Ammonium nutrition increases photosynthesis rate under water stress at early development stage of rice (Oryza sativa L.)

Content Provider	Springer Nature Link
Author	Guo, Shiwei Chen, Gui Zhou, Yi Shen, Qirong
Copyright Year	2007
Abstract	An hydroponic experiment with a simulated water stress induced by PEG (6000) was conducted in a greenhouse to study the effects of nitrate (NO$_{3}$ $^{−}$), ammonium (NH$_{4}$ $^{+}$) and the mixture of NO$_{3}$ $^{−}$ and NH$_{4}$ $^{+}$, on water stress tolerance of rice seedlings. Rice (Shanyou 63) was grown under non- or simulated water stress condition (10% (w/v) PEG, MW6000) with the 3 different N forms during 4 weeks. Under non-stressed condition no difference was observed among the N treatments. Under simulated water stress, seedlings grown on N-NO$_{3}$ $^{−}$ were stunted. Addition of PEG did not affect rice seedling growth in the treatment of only NH$_{4}$ $^{+}$ supply but slightly inhibited the rice seedling growth in the treatment of mixed supply of NO$_{3}$ $^{−}$ and NH$_{4}$ $^{+}$. Simulated water stress, when only N-NH$_{4}$ $^{+}$ was present, did not affect leaf area and photosynthesis rate, however, both parameters decreased significantly in the NO$_{3}$ $^{−}$ containing solutions. Under water stress, Rubisco content in newly expanded leaves significantly increased in the sole NH$_{4}$ $^{+}$ supplied plants as compared to that in plants of the other two N treatments. Under water stress, the ratio of carboxylation efficiency to Rubisco content was, respectively, decreased by 13 and 23% in NH$_{4}$ $^{+}$ and NO$_{3}$ $^{−}$ treatments, respectively. It is concluded that, water stress influenced the Rubisco activity than stomatal limitation, and this effects could be regulated by N forms.
Starting Page	115
Ending Page	124
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	296
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-06-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rice (Oryza sativa L.) Water stress Nitrogen form Photosynthesis Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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