In some genotypes growth of the aerial part of a plant help...

created [InstanceEdit:9030887] Naithani, Sushma, 2017-11-29
dbId 9030897
displayName In some genotypes growth of the aerial part of a plant help...
literatureReference
modified [InstanceEdit:9031074] Naithani, Sushma, 2017-11-29
schemaClass Summation
text In some genotypes growth of the aerial part of a plant helps it to escape submergence conditions. In others, SUB1A transcription factor is induced by ethylene which in turn inhibits the growth of plant in order to conserve energy for long term sustainance during flooding.

In rice, the multigenic SUBMERGENCE1 (SUB1) locus encodes three transcription factors of the group VII ethylene response factor family: SUB1A, SUB1B and SUB1C that determine the survival of plant during submergence. The submergence-triggered ethylene-mediated induction of SUB1A facilitates a quiescence survival strategy that inhibits gibberellin (GA)-induced elongation growth of aerial plant parts and saves energy for recovery period and thus, confers submergence tolerance. In other rice genotypes, underwater shoot and internode growth (elongation) is regulated in response to submergence as an escape stretegy, where ethylene responsive genes repress levels of ABA, which in turn causes increased levels of GA leading to the elongation of underwater shoot and internodes. The submergence gene-network is complex and involves many genes other than the SUB1 genes, which may or may not interact with SUB1 genes, has multiple feedback-loops and many check points that are regulated by various plant hormones.