Tapetal development and abiotic stress: a centre of vulnerability

摘要: Many self-fertilising crops are particularly sensitive to abiotic stress at the reproductive stage. In rice (Oryza sativa L.) and wheat (Triticum aestivum L.), for example, during meiosis young microspore stage indicates tapetum is highly vulnerable that developmental program appears be compromised. Tapetal hypertrophy can occur as a consequence of cold drought stress, programmed cell death (PCD) delayed or inhibited. Since correct timing tapetal PCD essential pollen reproduction, substantial losses in grain yield occur. rice, decrease wall invertase levels correlated with abortion results amount hexose sugars reaching tapetum, subsequently developing microspores, being severely reduced ('starvation hypothesis'). ABA gibberellin may modified by drought, influencing invertase(s) program, respectively. genes regulating development have been identified Arabidopsis thaliana (L.) Heynh. specific effects stresses on pathways now begin assessed.