Effects of short episodes of heat stress on flower production and fruit‐set of groundnut (Arachis hypogaea L.)

Prasad, P.V.V. and Craufurd, P.Q. and Summerfield, R.J. and et al, . (2000) Effects of short episodes of heat stress on flower production and fruit‐set of groundnut (Arachis hypogaea L.). Journal of Experimental Botany, 51 (345). pp. 777-784.

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Groundnuts (Arachis hypogaea) are an important crop of the semi-arid tropics where they are often exposed to maximum temperatures of >40°C for short periods during the growing season. The objectives of this study were to determine: (i) the effects of short periods of exposure to high temperature on flower production (FN), the proportion of flowers forming fruits (fruit-set) and the number of pegs and pods per plant (RNt); (ii) whether fruit-set is affected by high temperature during different periods of daylight in each diurnal cycle; and (iii) whether responses to temperature were qualitative or quantitative. Plants of cv. ICGV 86015 were grown in controlled environments at a day/night temperature of 28/22°C from sowing until 9 d after flowering (DAF). Then, cohorts of plants were: (a) exposed to day temperature of 28, 34, 42 or 48°C for 2, 4 or 6 d; or were (b) exposed to 34, 42 or 48°C for 6 d either throughout a 12 h day (08.00 to 20.00 h, WD), or only during the first 6 h (AM) or second 6 h (PM) of the day. Values of RNt were significantly reduced by high temperature, by duration of exposure, and by timing of exposure. Variation in FN was quantitatively related to floral bud temperatures during the day over the range 28-43°C. In contrast, only floral bud temperatures >36°C during AM and WD significantly reduced fruit-set and hence RNt, whereas high PM temperature had no effect on fruit-set. These findings indicate that the response of RNt to day temperature is quantitative and can be modelled by combining the responses of FN and fruit-set to temperature.

Item Type: Article
Additional Information: Dr S N Nigam research collection - Box No: 02.
Uncontrolled Keywords: Groundnut, flowering, Fruit-set, Heat stress, Temperature.
Author Affiliation: Plant Environment Laboratory, Department of Agriculture, The University of Reading, Cutbush Lane, Shinfield, Reading RG2 9AD, UK.
Subjects: Plant Production
Crop Improvement
Divisions: Groundnut
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 28 Mar 2013 14:12
Last Modified: 28 Mar 2013 14:12
Official URL: http://dx.doi.org/10.1093/jexbot/51.345.777
URI: http://eprints.icrisat.ac.in/id/eprint/9949

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