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Atmospheric CO2 enrichment effect on water use efficiency in chickpea (Cicer arietinum L.)
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2021-05-31 , DOI: 10.1111/jac.12505
Saurav Saha 1 , Debashis Chakraborty 1 , Vinay K Sehgal 1 , Madan Pal 2
Affiliation  

Effect of atmospheric CO2 enrichment on crop water relations was evaluated in an open-top chamber experiment on kabuli chickpea (Cicer arietinum L.; Pusa 1,105). Increase in atmospheric CO2 concentration (e[CO2], 580 ± 20 μmol/mol) resulted in 21%–46% increase in leaf water potential, and 7%–11% in relative leaf water content, indicating higher water content in leaves, compared to the ambient level (a[CO2], 384 ± 12 μmol/mol). Higher leaf water status was connoted through spectral indices over the growing period. A rise in CO2, however, brought increase in leaf diffusive resistance and canopy temperature by 15%–35% and 3%–11%, respectively, potentially indicating partial closure of stomata. Increase in leaf area index (13%–73%), and higher spectral vegetation index suggested improved growth of chickpea under e[CO2]. An increase in leaf area compensated the decrease in diffusive resistance, and therefore seasonal total water use was similar between enriched and ambient conditions. Although water use efficiency (WUE) increased by 30% (p < .05) due to an increase in crop biomass under e[CO2], the canopy conductance remained unaffected. Results suggest a possibility of improved plant water status, enhanced biomass production and increased WUE for chickpea, with similar crop water use under future e[CO2] levels.

中文翻译:

大气 CO2 富集对鹰嘴豆水分利用效率的影响 (Cicer arietinum L.)

kabuli鹰嘴豆 ( Cicer arietinum L.; Pusa 1,105)的开顶室实验中评估了大气 CO 2富集对作物水分关系的影响。大气 CO 2浓度(e[CO 2 ],580 ± 20 μmol/mol)的增加导致叶水势增加 21%–46%,相对叶含水量增加 7%–11%,表明较高的水含量叶,与环境水平相比(a[CO 2 ],384 ± 12 μmol/mol)。通过生长期间的光谱指数暗示较高的叶水状态。CO 2上升然而,叶片扩散阻力和冠层温度分别增加了 15%–35% 和 3%–11%,可能表明气孔部分关闭。叶面积指数的增加 (13%–73%) 和更高的光谱植被指数表明在 e[CO 2 ]下鹰嘴豆的生长得到改善。叶面积的增加补偿了扩散阻力的降低,因此季节性总用水量在富集条件和环境条件下相似。尽管 由于 e[CO 2下作物生物量的增加,水分利用效率 (WUE) 增加了 30% ( p < .05)],冠层电导不受影响。结果表明,在未来的 e[CO 2 ] 水平下,有可能改善植物水分状况、提高生物量产量和增加鹰嘴豆的 WUE,并具有相似的作物用水量。
更新日期:2021-07-24
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