Amylolytic activity and carbohydrate levels during the stamen ontogeny of a male fertile, and a 'gibberellin-sensitive' male sterile mutant of tomato (Lycopersicon esculentum)
1989
Bhadula, S.K. | Sawhney, V.K.
The activity of amylases, and the level of starch and soluble sugar content were analysed in the normal (+/+), a 'gibberellin-sensitive' male sterile stamenless-2 (sl-2/sl-2) mutant, and GA3-reverted sl-2/sl-2 mutant stamens of tomato (Lycopersicon esculentum Mill.). at various stages of development. In the mutant stamens, amylolytic activity did not differ from that of the normal until the tetrad stage, but thereafter it was significantly lower than that of normal stamens. The starch content also did not differ in the two lines at early stages of development. However, at later stages it decreased in normal stamens, whereas it remained unchanged in the mutant. The soluble sugar content gradually increased during the development of normal stamens. But in mutant stamens, it remained the same throughout development and was significantly lower than the normal. In GA3- reverted mutant stamen, the amylolytic activity and the level of starch and soluble sugars were comparable to normal stamens. It is proposed that the sl-2/sl-2 mutation, through its effects on endogenous gibberellins, affects the activity of amylases which, in turn, result in lower sugar levels leading ultimately to abnormal pollen development.
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