Abstract

The use of thermosensitive genic male sterility (TGMS) is well recognized in two-line heterosis breeding. The use of the TGMS system has several advantages over the cytoplasmic genic male sterility system, such as (1) its simple and efficient seed production system, and (2) its greater scope for enhancing heterosis because any genotype can be used as a male parent. To develop hybrids using the TGMS system, it is necessary to identify or develop lines that show a desirable transformation from fertility to sterility and vice versa.

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