Free proline accumulation in leaves of cultivated plant species under water deficit conditions
2004
Bandurska, H.,Akademia Rolnicza, Poznan (Poland). Katedra Fizjologii Roslin
The effect of water deficit caused by soil drought on the content of free proline as well as the degree of cell membrane damages in the leaves of three cultivated plant species having different farm usefulness and water requirements have been studied. The used plants were: poinsettia (Euphorbia pulcherrima Willd., 'Regina' and 'Cortez') grown for decorative purposes, a green vegetable of broccoli (Brassica oleracea var. botrytis, subvar. cymosa, 'Colonel' and 'Marathon') and a cereal plant of barley (the wild form Hordeum spontaneum and Hordeum vulgare 'Maresi'). The examined species differed in the size of the experienced stress, the largest RWC reduction was found in broccoli leaves, while somewhat smaller - in barley. In poinsettia leaves, the reduction of RWC level was not large or did not occur at all. The accumulation of free proline in the species under study was also variable. The largest amount of this amino acid tended to accumulate in broccoli leaves, whereas the increase of its level took place only at a strong dehydration of tissues. The increase of proline level was smaller in barley leaves than in broccoli, but that was found already at a small dehydration of tissues. In poinsettia leaves, a several fold increase of proline level was found at the early stage of the stress. The level of that amino acid gradually increased at consecutive times and did not depend on tissue dehydration. Damage of cell membranes amounted to 8.5-9.5 percent in barley leaves, about 3 percent in brocolli and to 0-2.6 percent in poinsettia
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