Effects of solar radiation on morphogenesis of cassava (Manihot esculenta Crantz)

Alcoy, Artemio B. (1983). Effects of solar radiation on morphogenesis of cassava (Manihot esculenta Crantz) Master's Thesis, School of Land, Crop and Food Sciences, The University of Queensland.

       
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Author Alcoy, Artemio B.
Thesis Title Effects of solar radiation on morphogenesis of cassava (Manihot esculenta Crantz)
School, Centre or Institute School of Land, Crop and Food Sciences
Institution The University of Queensland
Publication date 1983
Thesis type Master's Thesis
Supervisor Dr. Shu Fukai
Total pages 48
Language eng
Subjects 0701 Agriculture, Land and Farm Management
Formatted abstract Cassava cultivar MAus7 was grown in the relatively high latitude (27 ⁰0 37'S) environment at Redland Bay in Southeast Queensland, Australia. Morphological development and tuber yield were studied under three different levels of solar radiation, full sun (control), 78% light and 32% light. Artificial shading was imposed to achieve the desired radiation levels for two cassava crops planted on 6 October, 1981 and 24 November, 1981. The time of 35 days shading in January and February, 1982 corresponded to active tuber formation and early tuber bulking for the two crops.

Height of plants was affected by reduced solar radiation, generally shading producing taller plants by 14% than the control. The relatively taller plants displayed by the shaded plants was primarily attributed to the greater internode elongation of the newly produced stems. Leaf production on the main-stem did not show much differences among the light treatments resulting in almost equal number of leaves per stem. However, total leaf production per plant in the first planting varied extensively (64-187 leaves per plant) with the highest number of leaves produced in the control. This was mainly due to the production of more lateral branches and stem apices where new leaves were produced. Forking was also promoted by high levels of illuminance while shading delayed considerably and no forking was observed in the heavy shade during the experiment. There were no lateral branches and fork produced from the November planting at the end of the experiment in February.

Development of storage roots were strongly affected by reduced solar radiation levels. Final storage root number significantly declined from 10 tubers to 7 tubers per plant with respect to shading particularly in the November planting. Storage root length and diameter declined with increased level of illuminance and percent reductions (up to 22%) in storage root diameter was slightly higher than the percent reductions (16%) in storage root length. Tuber dry weights, shoot dry weights and total dry matter yield were 20-50% higher in the control as opposed to the shaded plants for both planting times.

Keyword Cassava
Plants -- Effect of light on
Solar radiation
Additional Notes

Spine title: Solar radiation effects on cassava morphogenesis.

 
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