Relationship of root and shoot traits and canopy temperature of upland cotton to drought resistance, lint yield, and fiber quality /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Studies were conducted in the field under irrigated and non-irrigated treatments to determine differences among six cotton genotypes for root traits, fruiting dynamics, lint yield, canopy temperature, and fiber quality. Greenhouse experiments were performed to quantify differences among genotypes for root growth and water use efficiency. Genotypes differed for root traits at the seedling, preflowering, and mature stages of plant development. Consistent differences occurred among genotypes for root-to-shoot ratio and total root dry weight. Results indicated genotypes CABU'CS-2-1-83 and Tamcot CD3H made more efficient use of photosynthates for above-ground plant growth. Genotypes differed for flower and boll production and boll retention. A positive relationship between total root dry weight at squaring and boll abscission indicated that decreases in normal fruit retention due to water stress may occur when necessary photosynthates are directed toward root growth rather than boll development. In 1986 and 1987, yield differences occurred among genotypes in the non-irrigated treatment only, with CABU'CS-2-1-83 and Tamcot CD3H producing the highest lint yields. Low root-to-shoot ratio at squaring was the most important and consistent trait associated with non-irrigated lint yield (R2=0.30), indicating the importance of photosynthate partitioning towards fruit development. Drought susceptibility indices indicated that CABU'CS-2-1-83 and Tamcot CD3H were more drought resistant than Deltapine 41, Paymaster 303 and Tamcot SP37H. Canopy temperature differed among genotypes and between treatments, with mean canopy temperature of the non-irrigated genotypes being 5°C higher. Irrigated canopy temperature measurements obtained immediately prior to peak flowering best predicted irrigated (R^2=0.93) and non-irrigated (R^2=0.59) lint yields. Reductions in fiber length, uniformity, strength, and micronaire occurred in the non-irrigated treatment. An experiment in glass front boxes demonstrated the potential of utilizing greenhouse studies for characterizing field root growth... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Plant Breeding." |
| Physical Description: | xiii, 127 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |