Growth and proline accumulation in mungbean seedlings as affected by sodium chloride

Sahu

Zeitschrift Für Naturforschung C

et al. 1999

Salt stress, Thylakoid membrane, Pigment-protein complex, PS II, Thermoluminescence, Mung bean ( Vigna radiata L.), Indian mustard (Brassica juncea Coss.)In the present study, mung bean (Vigna radiata L.) -a salt susceptible and Indian mustard (.Brassica juncea L.) -a salt resistant crop was studied to find out the differences in stress responses of these crops. Seedlings were grown in water soaked cotton under continuous illumination of 35 (.imole m 2 s 1 at 26 ± 1 °C. Salinity treatment of 0, 0.5 and 1.0% (w/v) was given to the seedlings at 6 day Photosynthetic pigment content and PS II electron trans port activity was reduced under salinity in both mung bean and Indian mustard. The pigment protein pattern of both the crops were similar. Ratio analysis of B and Q thermolumines cence (T L ) glow peaks suggested that S2Q a-charge recombination was relatively more af fected than S2/?Qb-charge recombinations.

“…Mung bean is a salt susceptible (Misra et al, 1996) and Indian mustard is salt tolerant crop (Misra et al, 1995). So it is assumed that their re sponses to salinity might vary.…”

Section: Resultsmentioning

confidence: 99%

“…Salinity affects growth and metabolism of plants (Misra et al 1995(Misra et al , 1996(Misra et al , 1997a. Chloroplasts are the most sensitive organelles affected by salt stress (Lapina and Popov, 1970).…”

Section: Introductionmentioning

confidence: 99%

Sodium Chloride Salt Stress Induced Changes in Thylakoid Pigment-Protein Complexes, Photosystem II Activity and Thermoluminescence Glow Peaks

Sahu

Zeitschrift Für Naturforschung C

et al. 1999

J Agronomy Crop Science

“…The previous studies have also shown that growth is depressed by salinity stress for both common bean (Tejera et al 2005, Gama et al 2007) and mungbean (Misra et al 1996, Sumithra et al 2006, although Bayuelo-Jimenez et al (2002) found considerable variability in salt tolerance when comparing numerous Phaseolus species, and this was especially so in wild types. Further studies are required to investigate potential mechanisms of tolerance to salinity stress in these two crops.…”

Section: Photosynthesis Transpirationmentioning

confidence: 89%

Effects of Deficit Irrigation and Salinity Stress on Common Bean (Phaseolus Vulgaris L.) and Mungbean (Vigna Radiata (L.) Wilczek) Grown in a Controlled Environment

Bourgault

Madramootoo

Webber

et al. 2010

As water for irrigation purposes becomes increasingly scarce because of climate change and population growth, there is growing interest in regulated deficit irrigation (RDI) as a way to improve efficiency of water usage and farm productivity in arid and semi‐arid areas. Salinity is also becoming an important problem in these same regions. Experiments were performed to investigate the effects of RDI and salt stress on two legumes crops, common bean (Phaseolus vulgaris L.) and mungbean (Vigna radiata (L.) Wilczek); previous work showed contrasting responses to RDI by these two crops under field conditions. The seed and biomass yields of both crops were reduced as a result of increasing water deficit stress; however, mungbean was able to maintain the same proportion of its biomass in reproductive structures and maintain its harvest index under stress, whereas common bean’s decreased. In addition, photosynthesis in mungbean was higher than in common bean and higher at the same levels of transpiration. Finally, salinity stress did not affect the water potential, harvest index or the specific leaf weight of either crop. There were no interactions between salinity and crops or RDI levels, which suggest that the two crops do not differ in their response to salinity stress, and that RDI levels do not modify this response.

“…Besides, it is well known that free amino acids are important osmolites accumulating in the cells of the different tissues stressed by salt and water, and have been proposed as responsible for salt tolerance (Greenway and Muns 1980, Itoh et al 1987, Kalaji and Pietkiewicz 1993, Schubert et al 1995, Misra et al 1996. AAT inhibition or decrease in AAT expression would be a part of the tissue response to saline stress through free amino acid accumulation.…”

Section: Naci MMmentioning

confidence: 98%

Changes of aspartate aminotransferase activity, its isoform pattern, and free amino acids content in peanut cotyledons during seed germination

Isola

Franzoni

2000

Acta Physiol Plant

After imbibition of peanut seeds, the concentration of free amino acids in cotyledons increases probably due to hydrolysis of reserve proteins. That increase was accompanied by a stimulation of aspartate aminotransferase (AAT, EC 2.6.1.1) activity especially pronounced between first and sixth day of imbibition. Peanut cotyledons contained several AAT isoforms which could be visualized after polyacrylamide gel electrophoresis (PAGE). Native PAGE of extracts from cotyledons of dry seeds demonstrate three active bands. The intensity of these bands increased reaching a maximum after 6th day of imbibition. An additional band appears transientely on 6th day, but is not visible after 14 days of incubation. A fastest band appears on this latter day. If germination takes place under hypersalinity conditions, the AAT activity severely diminishes and the tree amino acid concentration raises. The possibilities of different types of AAT regulation are discussed.