Capacity of proline acumulation in leaves as a drought tolerance indicator of wheat genotypes
2004
Zivcak, M.(Slovenska polnohospodarska univ. v Nitre (Slovak Republic). Katedra fyziologie rastlin | Brestic, M. | Hunkova, E. | Ferencova, J.
Proline is a dominant organic molecule, one of the osmolytes most frequently synthesized in plants. Under drought and osmotic stress conditions proline protects plant tissues, acts as a mediator of osmotic adjustment, as a stabilizer of subcellular structures as a scavenger of free radicals, acts as a means to regulate cytosolic pH, as a sink for energy and even as a stressrelated signal, or as a source of carbon and nitrogen for the poststress recuperation of plants. The proline content was determined by ninhydrine method in different varieties of winter wheat. Plants were cultivated in pots and they were subjected to water deficit. Water status in leaves was measured as relative water content (RWC) and water potential. Wheat cultivars showed different reactions to water deficit in capacity of proline accumulation as well as in sensitivity to water deficit. Each variety showed typical correlation curve between water potential or RWC and leave proline content. These curves as well as maximal capacity of proline accumulation could be used as a good selective trait for drought tolerance.
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