Practice question

Cleistogamy represents floral syndrome where flowers remain closed throughout anthesis, perianth never unfolding, thus anther dehiscence occurs inside bud envelope and pollen deposited directly onto adjacent stigma. Controlled by genes regulating lodicule expansion, corolla opening and jasmonic acid signaling affecting anther elongation. In cleistogamous rice mutant cl7 and barley cly1, suppression of petal opening enforced by mutation in AP2 transcription factor. Consequence obligate self-pollination ensuring seed set under rain or low pollinator activity, protecting pollen from desiccation and pathogens. For biotechnology, cleistogamy used as biological confinement for transgenes preventing gene flow, while drawback reduced genetic variability and limited scope for recombination-driven improvement. This understanding supports competitive exam preparation for NEET, GATE and CSIR NET concepts linking genotype with phenotype through molecular pathways involving transcription factors, hormones and metabolic enzymes that regulate development, adaptation and reproductive biology in applied breeding programs. Additional insights from genomic studies reveal QTL clusters, epigenetic modifications and protein interactions that influence trait expression under varied agro-climatic conditions and management.