Photosynthetica, 2019 (vol. 57), issue 4

Photosynthetica 2019, 57(4):1130-1141 | DOI: 10.32615/ps.2019.125

Morphological and physiological responses of Spatholobus suberectus Dunn to nitrogen and water availability

Z.-X. ZHANG1,2, J. ZHANG1,2,3, Y. GONG5, G.-Z. LIU1, L.-L. GAO1, P. ZHANG5, C.-T. CAI1,6
1 CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303 Yunnan, China
2 University of Chinese Academy of Sciences, 100049 Beijing, China
3 Institute of Medicinal Plants, Yunnan Academy of Agricultural Sciences, Kunming, 650200 Yunnan, China
5 Zhuzhou Qianjin Pharmaceutical Co., Ltd., Zhuzhou, 412007 Hunan, China
6 Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla, 666303 Yunnan, China

A pot study was conducted to elucidate morphological and physiological responses of Spatholobus suberectus Dunn accessions to four nitrogen application rates (0, 10, 20, and 30 mmol L-1) and two watering regimes (daily irrigation and irrigation every 10 d for a month). The results showed that water deficit led to marked decreases in leaf water relations and photosynthetic parameters regardless of the N treatments. Under drought conditions, the reductions in net photosynthesis occurred mainly due to stomatal factors. Although the leaf N content and stem mass ratio were positively correlated with N application, other morphological and physiological characteristics were negatively correlated or nonsignificantly correlated with N application under limited water supply. As the root nodules of S. suberectus can provide sufficient N supply, and high N applications made S. suberectus plants more vulnerable to drought stress, we suggest that no N supplement is required for S. suberectus seedlings.

Keywords: fertilizer; gas exchange; nitrogen-use efficiency; water-use efficiency; water stress.

Received: March 19, 2019; Accepted: September 4, 2019; Prepublished online: October 14, 2019; Published: November 1, 2019Show citation

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ZHANG, Z.-X., ZHANG, J., GONG, Y., LIU, G.-Z., GAO, L.-L., ZHANG, P., & CAI, C.-T. (2019). Morphological and physiological responses of Spatholobus suberectus Dunn to nitrogen and water availability. Photosynthetica57(4), 1130-1141. doi: 10.32615/ps.2019.125.
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