Studies on the physiological determinants of grain yield in five varieties of sorghum

Willey, R.W. and Basiime, D.R. (1973) Studies on the physiological determinants of grain yield in five varieties of sorghum. Journal of Agricultural Science, 81 (3). pp. 537-548.

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Abstract

The relative importance of head storage capacity and carbohydrate supply was examined in sorghum cv. Namatera (plant height 270 cm), Dobbs (180 cm), MUS 78 (100 cm), MUS 23 (85 cm) and MUS 70 (85 cm) by cutting off part of the head or the leaves at anthesis, or by shading or thinning at different growth stages. Varietal differences ranged from a situation where the head was little more than half-filled by the available carbohydrate (MUS 78), through intermediate stages (Dobbs and Namatera), to a situation where the head capacity limited the amount of carbohydrate that could be stored (MUS 23 and MUS 70). Some differences could be attributed to pre-anthesis competition between head and stem, but in the dwarfs a more important factor appeared to be pre-anthesis competition between head and leaf. It is suggested that for maximum efficiency of grain-yield production, maximum carbohydrate should be utilized for pre-anthesis head and leaf growth and that partitioning between these plant parts should be such that the supply of carbohydrate for grain filling is in balance with head storage capacity

Item Type: Article
Author Affiliation: Makerere University, Kampala, Uganda
Subjects: Crop Improvement > Genetics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 01 Jun 2012 08:38
Last Modified: 01 Jun 2012 08:38
URI: http://eprints.icrisat.ac.in/id/eprint/6041

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