Physiological responses related to increased grain yield under drought in the first biotechnology-derived drought-tolerant maize.

Autor: Nemali KS; Monsanto Company, St. Louis, MO, 63167, USA., Bonin C; Agrivida, Storrs, CT, 06269, USA., Dohleman FG; Monsanto Company, St. Louis, MO, 63167, USA., Stephens M; Monsanto Company, St. Louis, MO, 63167, USA., Reeves WR; Monsanto Company, St. Louis, MO, 63167, USA., Nelson DE; Monsanto Company, St. Louis, MO, 63167, USA., Castiglioni P; Dow AgroSciences LLC, 12849 Gorman Lane, Woodland, CA, 95695, USA., Whitsel JE; Monsanto Company, St. Louis, MO, 63167, USA., Sammons B; Monsanto Company, St. Louis, MO, 63167, USA., Silady RA; Biology Department, Southern Connecticut State University, New Haven, CT, 06515, USA., Anstrom D; Monsanto Company, St. Louis, MO, 63167, USA., Sharp RE; Division of Plant Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, 65211, USA., Patharkar OR; Division of Plant Sciences and Interdisciplinary Plant Group, University of Missouri, Columbia, MO, 65211, USA., Clay D; Plant Science Department, South Dakota State University, Brookings, SD, 57007, USA., Coffin M; Monsanto Company, St. Louis, MO, 63167, USA., Nemeth MA; Statistical Consultants Plus, St. Louis, MO, 63167, USA., Leibman ME; Monsanto Company, St. Louis, MO, 63167, USA., Luethy M; Monsanto Company, St. Louis, MO, 63167, USA., Lawson M; Monsanto Company, St. Louis, MO, 63167, USA.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2015 Sep; Vol. 38 (9), pp. 1866-80. Date of Electronic Publication: 2014 Nov 17.
DOI: 10.1111/pce.12446
Abstrakt: Maize (Zea mays ssp. mays L.) is highly susceptible to drought stress. This work focused on whole-plant physiological mechanisms by which a biotechnology-derived maize event expressing bacterial cold shock protein B (CspB), MON 87460, increased grain yield under drought. Plants of MON 87460 and a conventional control (hereafter 'control') were tested in the field under well-watered (WW) and water-limited (WL) treatments imposed during mid-vegetative to mid-reproductive stages during 2009-2011. Across years, average grain yield increased by 6% in MON 87460 compared with control under WL conditions. This was associated with higher soil water content at 0.5 m depth during the treatment phase, increased ear growth, decreased leaf area, leaf dry weight and sap flow rate during silking, increased kernel number and harvest index in MON 87460 than the control. No consistent differences were observed under WW conditions. This indicates that MON 87460 acclimated better under WL conditions than the control by lowering leaf growth which decreased water use during silking, thereby eliciting lower stress under WL conditions. These physiological responses in MON 87460 under WL conditions resulted in increased ear growth during silking, which subsequently increased the kernel number, harvest index and grain yield compared to the control.
(© 2014 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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