Gaju, O. and Reynolds, M. P. and Sparkes, D.L. and et al, . (2014) Relationships between physiological traits, grain number and yield potential in a wheat DH population of large spike phenotype. Field Crops Research. pp. 1-10.
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Abstract
Our objective was to investigate the relationships between spike traits, grain number and yield potential and their physiological basis in a doubled-haploid (DH) population derived from a cross between a CIMMYT spring wheat (Triticum aestivum L.) advanced line of large-spike phenotype (LSP2; +Tin1 tiller inhibition gene) and the UK winter wheat cultivar Rialto (R; −Tin1) of conventional spike phenotype. Field experiments were carried out in high radiation, irrigated conditions in NW Mexico in two seasons. Comparing the two groups of +Tin1 and −Tin1 DH lines, results showed the presence of the +Tin1 gene for tiller inhibition increased spike partitioning index (spike DM/above-ground DM at GS61 + 5 d; SPI) from 0.32 to 0.34 (+6.3%) (P < 0.01) and grains spike−1 by 5.1 (+13.9%) (P < 0.001), but reduced spikes m−2 by 20.7 (−5.7%) (P < 0.01). Overall a significant increase in grains m−2 of 865 (+6.6%) was observed in +Tin1 DH lines compared to −Tin1 DH lines (P < 0.05), but the effect on grain yield was not statistically significant. Above-grouund biomass at anthesis was not significantly affected by the presence/absence of the Tin1 gene; although results indicated the presence of the Tin1 gene increased photosynthetically active radiation interception from onset of stem elongation to anthesis, but decreased radiation-use efficiency during this phase. Our results indicated that introgressing the +Tin1 gene into modern wheat germplasm may offer scope to increase grains spike−1 and grains m−2 in irrigated, high radiation environments.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Spike fertility; Assimilate partitioning; Tillerinhibition; Awns; Wheat breeding |
| Author Affiliation: | Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Leicestershire LE12 5RD, UK |
| Subjects: | Crop Improvement |
| Divisions: | Other Crops |
| Depositing User: | Ms Ishrath Durafsha |
| Date Deposited: | 25 Jun 2014 05:13 |
| Last Modified: | 25 Jun 2014 05:13 |
| Official URL: | http://dx.doi.org/10.1016/j.fcr.2014.05.015 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/13288 |
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