With flower buds of three types (male, female and hermaphrodite) in watermelon
as testing materials, researchers Shan Wenying, Ji Gaojie, Zhang Jie, Gong
Guoyi, Zhao Hong, Xu Yong and Zhang Haiying made paraffin section to observe
the cytomorphological features of these flower buds at different development
stages.
The result showed that the floral primordial processes of these three flowers
had no visible differences. At the end of hermaphroditic stage, the length of
flower bud was about 0.8-1.0 mm and the differentiation development of male,
female and hermaphrodite flower began. Stamen primordia volume of male and hermaphrodite
flower augmented rapidly, and carpel primordia of female and hermaphrodite
flower began to differentiate into stigma and ovary. In deformity female
flower, the base of carpel primordia would stop the development after denting
to a certain degree, while the stamen primordia would not stop elongation and
continue to develop to form the mature stamen with small amount of mature
pollen grains.
*News on China Vegetables, a journal produced by the Institute of Vegetables
and Flowers, Chinese Academy of Agricultural Sciences.
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