Article

Germination and Seedling Growth in Grasspea (Lathyrus sativus) Cultivars under Salinity Conditions

Department of Agronomy, Faculty of Agriculture, Tarbiat Modarres University, P.O. Box 14115-336, Tehran, Iran.
Pakistan Journal of Biological Sciences 02/2007; 10(2):273-9. DOI: 10.3923/pjbs.2007.273.279
Source: PubMed

ABSTRACT

In four grasspea varieties include ardabil, sharekord, mashhad and zanjan, the effects of different salinity concentrations on seed germination percent, proline concentration, malondialdehyde (MDA), germination index, radicle and hypocotyl length and weight were studied. Result showed that salinity had significant effects on seed germination percentage and germination index. The most and least of germination percentage were observed in 6 and 18 dS m(-1), respectively. Salinity had significantly effect on radicle and hypocotyl length, dry and fresh weight, MDA and proline concentration of seedlings. Salinity had not effect on dry weight of seedling. Increasing salinity reduced radicle and hypocotyl length, dry and fresh weight of seedlings and enhanced proline and malondialdehyde in them. Sharkord cultivar had the most germination percentage at 18 dS m(-1) sodium chloride. Sharkord and ardabil varieties were the most tolerance and sensitive varieties to salinity stress, respectively.

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Available from: Seyed Ali Mohammad Modarres-Sanavy, Feb 14, 2015
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    • "Exposure to NaCl-significantly modulated early seedling growth and leaf biochemical parameters in grass pea genotypes under salinity stress [34], and quite alarmingly, enhanced the seed neurotoxin content in grass pea genotypes [34]. Vaz Patto et al. [30] reported good adaptability to salinity stress in the Mediterranean germplasm, while reduction of growth was known in Iranian germplasms of grass pea [35]. Although vast areas under grass pea cultivation are now salinityaffected and increasing salinity is posing great danger for broader introduction of promising genotypes (high yield with low seed neurotoxin content), virtually nothing is known about growth responses and primary antioxidant defense mechanism of this crop. "
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    ABSTRACT: Response of six improved grass pea genotypes to prolonged salinity stress was investigated on seedlings grown in pot experiment using 150 mM NaCl up to 60 days of growth after commencement of treatment (DAC). NaCl exposure significantly reduced growth potential of varieties PUSA-90-2 and WBK-CB-14, but no such effect was observed in varieties B1, BioL-212 and in two mutant lines LR3 and LR4. A time-bound measurement at 15, 30 and 60 DAC revealed significant reduction in plant dry matter production, orchestrated through abnormally low capacity of leaf photosynthesis accompanied by low K + /Na + ratio and onset of oxidative stress in all six genotypes at 15 DAC and the extension of the phenomena in PUSA-90-2 and WBK-CB-14 to 60 DAC. High superoxide dismutase (SOD) activity coupled with low ascorbate redox and declining ascorbate peroxidase (APX) and catalases (CAT) levels led to abnormal rise in H 2 O 2 content at reproductive stage (30 DAC) in the latter two genotypes, consequently, resulting in NaCl-induced oxidative damage. H 2 O 2 level in the rest of the four genotypes was modulated in a controlled way by balanced action of SOD, APX and CAT, preventing oxidative damage even under prolonged NaCl-exposure. Enzyme isoforms were involved in regulation of foliar H 2 O 2 -metabolism, which was critical in determining As tolerance of grass pea genotypes.
    Full-text · Article · Dec 2013
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    • "NaCl also causes the hardening of the cell wall and an increase in water conductivity of the plasma membrane, affecting the potential of cytosol and cell extensibility, reducing germination and seedling growth. The reduction of germination under saline conditions is also because latency is increased in the seeds (and Modarres Mahdavi, 2007). "

    Full-text · Article · Sep 2013
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    • "NaCl also causes the hardening of the cell wall and an increase in water conductivity of the plasma membrane, affecting the potential of cytosol and cell extensibility, reducing germination and seedling growth. The reduction of germination under saline conditions is also because latency is increased in the seeds (and Modarres Mahdavi, 2007). "

    Full-text · Dataset · Aug 2013
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