Ethylene and responses of plants to soil waterlogging and submergence | Semantic Scholar (2024)

The objective of this work is to present a literature review discussing aspects of floristic composition, biological nitrogen fixation, and morphophysiological adaptations that occur in the rhizobium-leguminous system in wetlands.

It is proposed that the expression of GDH1 was stimulated by hypoxia-induced carbon stress, while the enzyme protein might be involved during post-hypoxic stress contributing to the regeneration of 2-oxoglutarate via the GDH shunt.

A role for RpEXP1 in the initiation of submergence-induced petiole elongation of R. palustris is suggested and expression of Rp EXP1 seems to be under direct regulation of ethylene.

It is shown that resistance to longitudinal gas diffusion within roots of wetland species, which largely depends on diameter and the presence of gas-filled channels, was found to be less than in non-wetland species and can help maintain low internal ethylene concentrations by venting accumulated gas to the shoot and atmosphere.

Interestingly, stomatal aperture was reduced in hyperhydric plants, a previously reported response to injection of water into the apoplast, which demonstrates a reduced gas exchange between the symplast and its surroundings, which will consequently lead to the accumulation of gases in the Symplast.

Modification of classical allometric responses to Shade/flood tolerance tradeoffs by substrate saturation indicates a potential mechanism for the tradeoff in A. robusta.

The functional consequences of leaf orientation for plant performance and how exploitation of natural (genetic) variation can be instrumental in studying the relevance and control of leaf positioning are discussed.

The identification of ACC-induced (aci) genes through subtractive hybridisation of cDNA libraries constituted from internodes incubated with the ethylene precursor ACC and a possible role for OsACI3-1 and AtACI 3-1 in co-operating with MADS-box proteins to regulate GA biosynthesis is pinpointed.

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The results showed that the coleoptile elongation of rice seedling under water may be regulated by the accumulation of CO2 and C2H4 in and around the seedlings under hypoxic conditions.

The evidence obtained supports the view that, whether the root systems are wholly or only partially submerged by soil flooding the shoot is the major source or entry point for oxygen required by the roots; also, that oxygen passes more readily from shoot to root than it does through the wall cells of the root base.

The results indicate that ethylene produced during submergence is required for the stimulation of growth in submerged floating rice plants.

Air layers greatly increase the rate of photosynthetic carbon fixation by enlarging the surface of the gas-liquid interface available for CO(2) uptake from the water.

Data support the hypothesis that the export of ACC from low O(2) roots to the shoot is an important factor in the ethylene physiology of waterlogged tomato plants.

It is concluded that endogenous ethylene controls the induction of cavity formation in the Roots of Zea mays L. cv.

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