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JXB Advance Access originally published online on November 6, 2006
Journal of Experimental Botany 2007 58(2):187-194; doi:10.1093/jxb/erl192
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Osmotic adjustment in chickpea (Cicer arietinum L.) results in no yield benefit under terminal drought

Neil C. Turner1,*, Shahal Abbo2, Jens D. Berger1,3, SK Chaturvedi4, Robert J. French5, Christiane Ludwig3, DM Mannur6, SJ Singh7 and HS Yadava8

1Centre for Legumes in Mediterranean Agriculture, M080, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
2Hebrew University of Jerusalem, PO Box 12, Rehovot 767100, Israel
3CSIRO Plant Industry, Private Bag No. 5, Wembley, WA, 6913, Australia
4Indian Institute for Pulses Research, Kanpur, UP 208 024, India
5Western Australian Department of Agriculture and Food, Dryland Research Institute, PO Box 432, Merredin, WA 6415, Australia
6Institute for Pulse and Oilseeds Research, Gulbarga, Karnataka 585 101, India
7Rajasthan Agricultural University, Durgapura Agricultural Research Station, Jaipur, Rajasthan 302 018, India
8Jawaharlal Nehru Krishi Vishwa Vidyalaya, Sehore, MP 466 001, India

* To whom correspondence should be addressed. E-mail: ncturner{at}clima.uwa.edu.au

Variation in osmotic adjustment (OA) among chickpea (Cicer arietinum L.) cultivars has been observed when exposed to terminal drought, but some studies suggest that this benefits yield while others suggest it does not benefit yield in water-limited environments. In the present study, parents differing in OA were crossed and a set of advanced breeding lines (ABLs) developed for yield testing. The variation in OA during podding was measured under terminal drought in the F2, F3, F7, and F8 progeny and in the parents by either rehydrating the leaves before sampling for osmotic potential (OP) or by measuring the relative water content (RWC) and OP on adjacent leaves for the calculation of the OP at full turgor. Yields were measured in the F8 progeny under terminal drought in Australia and India. While differences in OA were measured in the chickpea lines and parents, OA varied from year to year and did not consistently benefit yield when measured in the field under terminal drought. In Australia, differences in OA were not associated with any yield benefit in any year, while in India early flowering resulted in higher yields at three of the four sites, and OA had an inconsistent effect on seed yields. A comparison of OP at full turgor measured after rehydration and from measurements of RWC and OP showed that the rehydration technique underestimated OA. The lack of contribution of OA to yield of chickpea is discussed.

Key words: Advanced breeding lines, early flowering, phenology, terminal drought, yield components


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