Effect of drought on enzymes and free proline in rice varieties

Mali, P. C.; Mehta, S. L.

doi:10.1016/s0031-9422(00)88781-6

Cited by 43 publications

(23 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The concentrations of these exogenously added compounds needed to obtain a significant degree of protection are often quite high (200-500 mM Pro; Pollard and Wyn Jones, 1979;Crowe et al, 1984b;Schwab and Gaff, 1990) compared with what some plants produce. NaCl-stressed rice, for example, has been reported to accumulate 8 to 12 jumol Pro g" 1 dry weight (Mali and Mehta, 1977), which might not produce the necessary molarity in the cell unless it is concentrated in a specific compartment. Before we could begin to understand how exogenous applications of osmoprotectants might reduce stressassociated damage, we had to identify the types of molecules likely to be found in rice.…”

Section: B Controlmentioning

confidence: 99%

“…Before we could begin to understand how exogenous applications of osmoprotectants might reduce stressassociated damage, we had to identify the types of molecules likely to be found in rice. Pro was known to accumulate in osmotically stressed rice (Mali and Mehta, 1977;Chou et al, 1991;Alia and Saradhi, 1993). Our survey of major solutes revealed that rice also accumulates various polyols and, more interestingly, trehalose.…”

Section: B Controlmentioning

confidence: 99%

“…It m a y b e protecting a few essential targets that cannot b e protected b y trehalose or a n y of the other solutes that rice accumulates. Because rice accumulates Pro normally when stressed (Mali and Mehta, 1977;C h o u et al, 1991; Alia a n d Sarahi, 1993), it is possible that the exogenous addition is not necessary a n d may have overtaxed other systems. Whereas trehalose seemed the most effective of the t w o osmoprotectants tested here, it is important to note that trehalose is not m a d e throughout the plant nor does it accumulate quickly i n roots.…”

Section: Pro Induces Sa/t Messenger Accumulationmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Osmoprotectants upon NaCl Stress in Rice

et al. 1997

View full text Add to dashboard Cite

Plants accumulate a number of osmoprotective substances in response to NaCl stress, one of them being proline (Pro). While characterizing some of the changes in solute accumulation in NaCIstressed rice (Oryza sativa L.), we identified several other potential osmoprotectants. One such substance, trehalose, begins to accumulate in small amounts in roots after 3 d. We performed a series of experiments to compare the effects of Pro and trehalose on ion accumulation to determine whether the two chemicals protect the same physiological processes. We found that Pro either has no effect or, in some cases, exasperates the effect of NaCl on growth inhibition, chlorophyll loss, and induction of a highly sensitive marker for plant stress, the osmotically regulated sa/T gene. By contrast, low to moderate concentrations of trehalose reduce Na+ accumulation, sal" expression, and growth inhibition. Somewhat higher concentrations (10 mM) prevent NaCI-induced loss of chlorophyll in blades, preserve root integrity, and enhance growth. The results of this study indicate that during osmotic stress trehalose or carbohydrates might be more important for rice than Pro.

show abstract

Section: B Controlmentioning

confidence: 99%

Section: B Controlmentioning

confidence: 99%

Section: Pro Induces Sa/t Messenger Accumulationmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Osmoprotectants upon NaCl Stress in Rice

et al. 1997

View full text Add to dashboard Cite

show abstract

“…

(3,6,10,12,16).The accumulation of proline in a number of crop plant leaves in response to water stress has been demonstrated and is positively correlated with increased water stress (12,15,16). Similar accumulations occur in plants subjected to salinity (osmotic) stress (6) as well as other stresses, such as nutrient deficiencies (9)

…”

mentioning

confidence: 98%

Oxidation of Proline by Mitochondria Isolated from Water-Stressed Maize Shoots

Sells¹,

Koeppe²

1981

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…In view of drought resistance, increasing attention has been given to changes in amino acid metabolism, especially remarkable accumulations of proline (2,3). SINGH et a/.…”

mentioning

confidence: 99%