High phosphorus supply enhances leaf gas exchange and growth of young Arabica coffee plants under water deficit

IF 1.6 4区农林科学 Q1 Agricultural and Biological Sciences Experimental Agriculture Pub Date : 2022-08-01 DOI:10.1017/S0014479722000266

M. Rakocevic, Paulo Eduardo R. Marchiori, F. C. Zambrosi, E. Machado, A. Maia, R. V. Ribeiro

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Abstract

Abstract Drought is considered as the major environmental stress affecting coffee production, and high phosphorus (P) supply may alleviate the drought effects on crop metabolism. Here, we hypothesized that high P supply would mitigate the impacts of drought on Arabica coffee physiology, morphology, and biomass accumulation. Potted Arabica coffee plants were grown under two P levels: the recommended P fertilization (P), and twice the recommended fertilization (+P), and two water regimes: well-watered and water withholding for 32 days. Leaf, stem, and root P concentrations were increased under +P, with plants showing higher photosynthesis and growth than the ones receiving the recommended P dose. Higher plant growth under high P supply seems to upregulate leaf photosynthesis through the source–sink relationship. Under the water deficit, the reduction of leaf photosynthesis, stomatal conductance, transpiration, water use efficiency, carboxylation efficiency, chlorophyll content, number of plagiotropic branches, plant leaf area, and vegetative biomass production was similar comparing plants fertilized with the recommended P to those supplied with +P. However, Arabica coffee trees under high P supply and water deficit presented morphological and physiological traits similar to plants under well-watered and recommended P fertilization.

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高磷供应促进了水分亏缺条件下阿拉比卡咖啡幼苗叶片气体交换和生长

干旱被认为是影响咖啡生产的主要环境胁迫，高磷供应可以缓解干旱对作物代谢的影响。在这里，我们假设高磷供应可以减轻干旱对阿拉比卡咖啡生理、形态和生物量积累的影响。盆栽阿拉比卡咖啡植株在两种磷水平下生长:推荐施磷肥(P)和两倍推荐施磷肥(+P)，以及两种水分制度:充分浇水和32天不浇水。在+P处理下，叶片、茎和根的磷浓度增加，植株的光合作用和生长都比推荐磷处理下的植株高。在高磷供应下，植物的高生长似乎通过源库关系上调了叶片光合作用。在水分亏缺条件下，施用推荐磷与施用+P对叶片光合作用、气孔导度、蒸腾、水分利用效率、羧化效率、叶绿素含量、斜向分支数、植物叶面积和营养生物量产量的影响相似。高磷缺水条件下，阿拉比卡咖啡树的形态和生理特征与水分充足和推荐施磷条件下相似。

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来源期刊

Experimental Agriculture 农林科学-农艺学

CiteScore

2.50

自引率

6.20%

发文量

审稿时长

24 months

期刊介绍： With a focus on the tropical and sub-tropical regions of the world, Experimental Agriculture publishes the results of original research on field, plantation and herbage crops grown for food or feed, or for industrial purposes, and on farming systems, including livestock and people. It reports experimental work designed to explain how crops respond to the environment in biological and physical terms, and on the social and economic issues that may influence the uptake of the results of research by policy makers and farmers, including the role of institutions and partnerships in delivering impact. The journal also publishes accounts and critical discussions of new quantitative and qualitative methods in agricultural and ecosystems research, and of contemporary issues arising in countries where agricultural production needs to develop rapidly. There is a regular book review section and occasional, often invited, reviews of research.