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Response of pigeonpea genotypes of different maturity duration to temperature and photoperiod in Kenya

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http://www.bioline.org.br/abstract?id=cs07009&lang=en
 
Title Response of pigeonpea genotypes of different maturity duration to temperature and photoperiod in Kenya
 
Creator Silim, S N
Gwataa, E T
Coeb, R
Omanga, P A
 
Subject Pigeonpea
 
Description Pigeon pea (Cajanus cajan) is one of the major grain legumes grown in the tropics and subtropics. The crop is grown rainfed in prone drought areas where daylength varies from 11 to 14 h and large differences in temperature are experienced, largely due to variations in altitude and latitude. Field studies were conducted with different pigeon pea in Kenya to determine the effect of photoperiod and temperature on flowering. Variation in temperature was achieved by planting six genotypes at four locations varying in altitude where temperature decreased with increasing altitude, and variation in photoperiod was achieved through artificial lighting (approximately 12.6 h, natural daylength, 14.5 h and 16.0 h). The genotypes used were carefully selected to represent different maturity duration (extra-short-, short-, medium- and long-maturity durations) and major pigeon pea production regions. Equations that describe the rates of development (1/f) were used to determine rates of progress of each genotype towards flowering as influenced by temperature and photoperiod. For photoperiods below 13 h, rates of progress towards flowering were influenced by temperature in five genotypes (ICPL 90011, ICPL 87091, ICP 7035, ICP 6927 and ICEAP 00040). The optimum temperature for rapid flowering were 24.7°C for the extra-short-duration genotype, 23.1°C for the short-duration genotype, 23.8 and 22.2°C for medium-duration genotypes and 18.3°C for the long-duration genotypes, 22.2°C for medium-duration genotypes and 18.3°C for the long-duration genotypes which indicated that the area of origin had a strong influence on adaptation. The effects of photoperiod on the rates of progress towards flowering were investigated only under sub-optimal temperatures. The extra-short-duration genotype (ICPL 90011) was the least responsive to variation in photoperiod, while the two long-duration genotypes (ICEAP 00040 and T-7) were the most sensitive to photoperiod variation with flowering rate reduced by 0.001 d-1 per hour increase in daylength.
 
Publisher African Crop Science Society
 
Date 2007
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/765/1/African_Crop_Science_Journal_15%282%2973-81_2007.pdf
Silim, S N and Gwataa, E T and Coeb, R and Omanga, P A (2007) Response of pigeonpea genotypes of different maturity duration to temperature and photoperiod in Kenya. African Crop Science Journal, 15 (2). pp. 73-81. ISSN 2072-6589