Transgenic peanut overexpressing the DREB1A transcription factor has higher yields under drought stress

Bhatnagar-Mathur, P and Rao, J S and Vadez, V and Dumbala, S R and Rathore, A and Yamaguchi-Shinozaki, K and Sharma, K K (2014) Transgenic peanut overexpressing the DREB1A transcription factor has higher yields under drought stress. Molecular Breeding, 33 (2). pp. 327-340. ISSN 1572-9788

	PDF (Author version post-print) Restricted to ICRISAT users only until 1 September 2014. Download (1MB) | Request a copy
	PDF - Accepted Version Restricted to ICRISAT users only Download (757kB) | Request a copy

Abstract

Transgenic research using the DREB group of transcription factors has received much attention in developing drought-tolerant and climate-ready varieties of crop plants. While many reports have demonstrated increased tolerance to water deficits under laboratory and greenhouse conditions, only a few have tested possible effects under field conditions, with limited success in most cases. Here, we present evidence of a transgenic solution for enhanced drought tolerance in peanut (Arachis hypogaea L.), which is an important grain legume and a valuable cash crop for smallholder and resource-poor farmers occupying the largest portion of the farming systems in low income food deficit countries. The presence, integration, expression and inheritance of the transgene in advancing generations of the transgenic peanut plants were assessed using PCR, Southern blot, inverse-PCR, RT-PCR and q-PCR techniques. Four trials were conducted in various water stress regimes under varying vapour pressure deficits (VPDs), and drought tolerance was studied using various component traits of drought. A substantial yield improvement of up to 24 % in drought trials under field conditions was achieved across a wide range of stress intensities and was related to higher harvest indices (HIs). All transgenic events had significantly higher seed filling under drought and displayed 20–30 % lower pod yield reduction than their untransformed counterpart under drought stress. Two transgenic events showed yield advantage under drought stress that consistently had higher pod and seed yield than the untransformed parent under drought stress across all trials, without displaying any yield penalty under irrigated conditions.

Item Type:	Article
Divisions:	RP-Grain Legumes
CRP:	CGIAR Research Program on Grain Legumes
Uncontrolled Keywords:	Peanut, DREB1A transcription factor, Higher yields, Drought stress
Subjects:	Mandate crops > Groundnut
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	19 Sep 2013 04:53
Last Modified:	19 Aug 2016 04:34
URI:	http://oar.icrisat.org/id/eprint/7112
Official URL:	http://dx.doi.org/10.1007/s11032-013-9952-7
Projects:	UNSPECIFIED
Funders:	Government of India - Department of Biotechnology
Acknowledgement:	The authors acknowledge JIRCAS, Japan for providing the gene constructs used in this study. We thank Dr. William D. Dar, Director General, ICRISAT for his keen interest and constant encouragement for this work. We thank Drs. Deborah Delmer and Thomas Sinclair for their critical comments on the manuscript. The excellent technical assistance from Kanaka Reddy, Md. Yousuf, C. Lakshminarayana and D. Pandary is acknowledged. We thank Ms. Roma Das for her help with the statistical analysis. This research was undertaken as a part of the CGIAR Research Program on Grain Legumes, and partly supported by a grant from the Department of Biotechnology (DBT), Government of India.
Links:	Google Scholar

View Statistics

Actions (login required)

View Item