Grain gibberellic acid-like content and seedling root apical characteristics in parent and hybrid rice (Oryza sativa L.)
1992
Miranda, Ma.L.L.
Eighteen parent and hybrid rices were used to investigate the relationships among grain gibberellic acid-like levels, seedling root apical characteristics, seedling growth and hybrid vigor. Hybrids had significantly higher levels of grain gibberellic acid-like levels, meristem length, mitotic indices, seedling length, fresh and dry weight of shoots and roots, compared with their immediate parents. Early differentiation in root apex as shown by the short distance between the root cap boundary to the first root hair in the root apex was also observed in hybrids. Correlation analyses showed direct relationship among the different root apex characteristics with gibberellic acid-like levels, indicating the significance of the root apex in the expression of hybrid vigor. Based on the present results, the above root apical characters may be used as selection criterion for seedling vigor in rice. However, further experimentation in the hormonal control of root apical growth is highly recommended to strengthen this proposal.
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