Simulating growth, development, and yield of tillering pearl millet. III. Biomass accumulation and partitioning

van Oosterom, E.J., O'Leary, G.J., Carberry, P.S. and Craufurd, P.Q. (2002) Simulating growth, development, and yield of tillering pearl millet. III. Biomass accumulation and partitioning. Field Crops Research, 79 2-3: 85-106. doi:10.1016/S0378-4290(02)00156-9


Author van Oosterom, E.J.
O'Leary, G.J.
Carberry, P.S.
Craufurd, P.Q.
Title Simulating growth, development, and yield of tillering pearl millet. III. Biomass accumulation and partitioning
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 2002-11-20
Sub-type Article (original research)
DOI 10.1016/S0378-4290(02)00156-9
Volume 79
Issue 2-3
Start page 85
End page 106
Total pages 22
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2002
Language eng
Subject C1
300203 Plant Improvement (Selection, Breeding and Genetic Engineering)
620108 Grain legumes
Abstract Pearl millet landraces from Rajasthan, India, yield significantly less than improved cultivars under optimum growing conditions, but not under stressed conditions. To successfully develop a simulation model for pearl millet, capable of capturing such genotype x environment (G x E) interactions for grain yield, we need to understand the causes of the observed yield interaction. The aim of this paper is to quantify the key parameters that determine the accumulation and partitioning of biomass: the,light extinction coefficient, radiation use efficiency (RUE), pattern of dry matter allocation to the leaf blades, the determination of grain number, and the rate and duration of dry matter accumulation into individual grains. We used data on improved cultivars and landraces, obtained from both published and unpublished sources collected at ICRISAT, Patancheru, India. Where possible, the effects of cultivar and axis (main shoot vs. tillers) on these parameters were analysed, as previous research suggested that G x E interactions for grain yield are associated with differences in tillering habit. Our results indicated there were no cultivar differences in extinction coefficient, RUE, and biomass partitioning before anthesis, and differences between axes in biomass partitioning were negligible. This indicates there was no basis for cultivar differences in the potential grain yield. Landraces, however, produced consistently less grain yield for a given rate of dry matter accumulation at anthesis than did improved cultivars. This was caused by a combination of low grain number and small grain size. The latter was predominantly due to a lower grain growth rate, as genotypic differences in the duration of grain filling were relatively small. Main shoot and tillers also had a similar duration of grain filling. The low grain yield of the landraces was associated with profuse nodal tillering, supporting the hypothesis that grain yield was below the potential yield that could be supported by assimilate availability. We hypothesise this is a survival strategy, which enhances the prospects to escape the effects of stress around anthesis. (C) 2002 E.J. van Oosterom. Published by Elsevier Science B.V. All rights reserved.
Keyword Agronomy
Biomass Accumulation
Grain Number
Grain Size
Partitioning
Pearl Millet
Rue
Stem Growth
Pennisetum-typhoides S
Arid Tropical Environment
Radiation Use Efficiency
Dry-matter Production
Nitrogen-fertilizer
Triticum-aestivum
Plant-population
Spring Wheat
Grain-yield
Genotypic Differences
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Agriculture and Food Sciences
 
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Created: Wed, 15 Aug 2007, 03:51:11 EST