Craufurd, P.Q. and Prasad, P.V.V. and Summerfield, R.J. (2002) Dry matter production and rate of change of harvest index at high temperature in peanut. Crop Science, 42 (1). pp. 146-151.
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Abstract
The concept of a linear increase in harvest index, dHI/dt, has proven very useful for crop simulation modeling. The effect of high temperature on the response of dHI/dt of pods and seeds of peanut (Arachis hypogaea L.) has not been described. The objectives of this work were to determine (i) whether dHI/dt was linear at high temperature, (ii) whether high temperature affected dHI/dt and/or the timing of the linear phase of increase in HI, and (iii) whether there was genotypic variation in the response of dHI/dt to high temperature. Four peanut genotypes varying in heat tolerance were grown in pots at either 28/22 or 38/22 degrees C from 21 to 90 d after planting (DAP). Plants were harvested on 10 occasions starting 27 DAP and total dry matter accumulation and partitioning measured. High temperature reduced total dry weight by 20 to 35%, seed HI by 0 to 65%, and seed dry weight by 23 to 78%. At 28/22 degrees C, dHI/dt for pods and seeds was linear and varied from 0.0058 to 0.0109 d(-1). At 38/22 degrees C, dHI/dt of pods and seeds was also linear and varied from 0.0028 to 0.0089 d(-1). There were genotypic differences in response to temperature. High temperature had no effect on dHI/dt in moderately tolerant genotypes 796 and 47-16. In susceptible genotypes ICGV 86016 and ICGV 87282, however, the start of pod and seed filling was delayed by 5 to 9 d and dHI/dt reduced by 20 to 65% at 38/22 degrees C. Reductions in pod and seed dry weight at 38/22 degrees C were therefore due to reductions in total dry matter and dHI/dt, depending on the heat tolerance of the genotype. Crop models need to account for genotypic differences in the response of timing and rate of dHI/dt to high temperature to successfully simulate yields in warmer environments.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Plant Environment Lab., Univ. of Reading, Dep. of Agriculture, Cutbush Lane, Shinfield, Reading RG2 9AD, UK |
| Subjects: | Plant Production Crop Improvement |
| Divisions: | Groundnut |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 07 Jun 2011 05:31 |
| Last Modified: | 07 Jun 2011 05:32 |
| Official URL: | https://www.crops.org/publications/cs/articles/42/... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2128 |
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