| Pak. J. Bot., 37(3): 575-584, 2005. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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YIELD AND QUALITY PARAMETERS OF WHEAT GENOTYPES AS AFFECTED BY SOWING DATES AND HIGH TEMPERATURE STRESS MAHBOOB ALI SIAL, M. AFZAL ARAIN, SHAMADAD KHANZADA MAZHAR H. NAQVI, M. UMAR DAHOT1 AND NISAR A. NIZAMANI
Abstract:
Twelve wheat genotypes bred at this Institute were assessed for yield
and quality parameters at two levels of sowing dates i.e., normal (18th
November) and late sowing (11th December). The normal temperature persisted
from December to February after which there was consistent rise in the
temperature with heat shocks of 35oC in the end of March. With delayed
planting, the development of plant organs and transfer from source to
sink were remarkably affected, which was reflected by overall shortening
of plant height, reduction in number of internodes, days to heading,
days to maturity and grain filling period and ultimately in the reduction
of yield and yield components. The protein content of the genotypes
was higher in late condition, possibly due to low grain weight. Genotypic
responses were almost similar and in the same direction, however, the
intensity varied. Plant Genetics Division, Nuclear Institute of Agriculture (NIA), Tando Jam- 70060, Pakistan. University of Sindh, Jamshoro-76080, Pakistan. |
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