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

文献类型: 外文期刊

第一作者: Zhang, Z. -X.

作者: Zhang, Z. -X.;Zhang, J.;Liu, G. -Z.;Gao, L. -L.;Cai, C. -T.;Zhang, Z. -X.;Zhang, J.;Zhang, J.;Gong, Y.;Zhang, P.;Cai, C. -T.

作者机构:

关键词: fertilizer; gas exchange; nitrogen-use efficiency; water-use efficiency; water stress

期刊名称:PHOTOSYNTHETICA ( 影响因子:3.189; 五年影响因子:3.38 )

ISSN: 0300-3604

年卷期: 2019 年 57 卷 4 期

页码:

收录情况: SCI

摘要: 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.

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