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#TGMS

2 public questions tagged with this topic.

Plant Breeding 2

TGMS expression depends on:

Thermo-sensitive genetic male sterility expression modulated primarily by ambient temperature experienced by developing anthers during critical window from secondary branch differentiation to meiosis. Molecular switch involves temperature-dependent processing of UbL40 mRNA or activity of RNase Z encoded by tms5 gene. At high temperature exceeding critical sterility inducing point typically 26 to 28 Celsius for rice, abnormal accumulation of mRNA triggers ribonuclease dysfunction, persistence of tapetum and premature microspore degeneration resulting in complete pollen sterility with shriveled

Ref: Zhang et al PNAS 2012 tms5 RNase; Lee DS Rice TGMS molecular mechanism; Frontiers thermo-sensitive GMS review.

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Plant Breeding 2

Environment-sensitive GMS includes:

Environment-sensitive genic male sterility category includes conditional nuclear sterility reversible by external cues, divided into thermo-sensitive GMS TGMS where sterile to fertile transition governed by temperature threshold during young panicle stage, and photoperiod-sensitive PGMS governed by day length threshold perceived via phytochrome signaling. Some lines respond to both termed PTGMS. Examples: rice TGMS line Annong S-1 becomes sterile above 24C, fertile below, while NK58S PGMS sterile under long days greater than 13.5 h fertile under short days. Genes identified include pms3 encodi

Ref: Yuan Longping Two-line hybrid rice concept; Frontiers Plant Sci EGMS overview 2023; PubMed molecular TGMS PGMS.

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