Why is sterility not a disadvantage?
Asked by | 8th Jun, 2009, 11:37: PM
They are not always disadvantageous. On the contraray, male sterility systems are widely exploited in crop plants for hybrid breeding because of the convenience to control the sterility expression by manipulating the gene–cytoplasm combinations in any selected genotype. Incorporation of these systems for male sterility evades the need for emasculation in cross-pollinated species, thus encouraging cross breeding producing only hybrid seeds under natural conditions. Male sterility has propagation potential in nature since it can still set seed and is important for crop breeding, while female sterility does not. Male sterility can be aroused spontaneously via mutations in nuclear and/or cytoplasmic genes.
(Sugarcane is a vegetatively propagated crop in which planted stem segments yield a plant crop, followed by several consecutive ratoon crops grown from underground buds after each harvest. Sugarcane is propagated from cuttings, rather than from seeds; although certain types still produce seeds, modern methods of stem cuttings have become the most common method of reproduction. Each cutting must contain at least one bud, and the cuttings are usually planted by hand. Once planted, a stand of cane can be harvested several times; after each harvest, the cane sends up new stalks, called ratoons)
Answered by | 9th Jun, 2009, 09:41: PM
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