Abstract
1. The authors have found the abortive anthers grouped upon staminal column in cotton and kenaf. 2. These abnormal anthers were observed to involve sterile pollens without contents, providing with the pollen wall that trends to show irregular curvature. 3. This abnormality is due to malnutrition that partially induced in buds at the vigorous growing stage by sudden change of temperature covering morning to evening. 4. In the case of kenaf, furthermore, the abnormal anthers are numbered more at the upper part of staminal column (the side facing to stem) that the lower part (facing to soil surface). This is explained by the accumulation of gravitational stimulus towards the upper part.
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