A significant increase in rhizosheath carboxylates and greater specific root length in response to terminal drought is a
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A significant increase in rhizosheath carboxylates and greater specific root length in response to terminal drought is associated with greater relative phosphorus acquisition in chickpea Manish Sharma & Jiayin Pang & Zhihui Wen & Axel De Borda & Hee Sun Kim & Yifei Liu & Hans Lambers & Megan H. Ryan & Kadambot H. M. Siddique Received: 7 July 2020 / Accepted: 20 November 2020 # Springer Nature Switzerland AG 2020
Abstract Aims We investigated the effects of water stress under low phosphorus (P) supply on P-acquisition by chickpea, and identified a genotype with faster relative growth and P-acquisition rates. Methods We grew four genotypes in pots filled with a sand and soil mixture with a low P availability in a glasshouse. Plants were either well-watered or waterstressed, imposed at the reproductive stage. Plants were harvested when water-stressed plants fully closed their stomata. Results For all four genotypes, water stress reduced shoot and root growth, root mass ratio, and shoot P content, while it increased specific root length (except in ICC 456), water-use efficiency and the amount of
rhizosheath carboxylates per gram root dry weight. A faster relative shoot P-acquisition rate in ICC 2884 was associated with a greater specific root length, a smaller mean root diameter and a greater increase in the amount of rhizosheath carboxylates in response to water stress under low P supply. Interestingly, under water stress ICC 2884 also maintained a similar physiological Puse efficiency to that of the well-watered plants. Conclusions ICC 2884 is recommended as a parental genotype in chickpea breeding programs to develop cultivars for low-P and terminal drought environments. Keywords Carboxylates . Phosphorus acquisition . Phosphorus-use efficiency . Rhizosheath . Stomatal conductance . Water stress
Responsible Editor: Martin Weih. M. Sharma : J. Pang : Z. Wen : A. De Borda : H. S. Kim : Y. Liu : H. Lambers : M. H. Ryan : K. H. M. Siddique The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6001, Australia M. Sharma : J. Pang (*) : H. S. Kim : M. H. Ryan : K. H. M. Siddique UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA 6001, Australia e-mail: [email protected] Z. Wen Department of Plant Nutrition, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
A. De Borda Agronomy Engineering School of Purpan, 75 voie du Toec-BP 57611, 31076 Toulouse, France Y. Liu College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China H. Lambers School of Biological Sciences, University of Western Australia, Perth, WA 6009, Australia
Plant Soil
Introduction Chickpea (Cicer arietinum L.) is the world’s third most important grain legume, occupying 14.5 Mha (FAOSTAT 2017). It is cultivated either on stored soil moisture after the summer rainy season in subtropical regions (South Asia, eastern Africa and north-eastern Australia) or on current rainfall in Canada and Me
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