scholarly journals Polyamine regulates tolerance to water stress in leaves of white clover associated with antioxidant defense and dehydrin genes via involvement in calcium messenger system and hydrogen peroxide signaling

2015 ◽  
Vol 6 ◽  
Author(s):  
Zhou Li ◽  
Yan Zhang ◽  
Dandan Peng ◽  
Xiaojuan Wang ◽  
Yan Peng ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Water Stress ◽  
White Clover ◽  
Antioxidant Defense ◽  
Messenger System ◽  
Dehydrin Genes

Water stress affects the productivity, growth components, competitiveness and water relations of phalaris and white clover growing in a mixed pasture

1992 ◽  
Vol 43 (3) ◽  
pp. 659 ◽  
Author(s):  
L Guobin ◽  
DR Kemp ◽  
GB Liu
Keyword(s):  
Water Stress ◽  
Soil Water ◽  
White Clover ◽  
Leaf Growth ◽  
Leaf Water ◽  
Water Potentials ◽  
Relative Water ◽  
Dry Conditions ◽  
Leaf Appearance ◽  
Water Contents

The effect of water stress during summer and recovery after rain on herbage accumulation, leaf growth components, stomatal conductance and leaf water relations of white clover (Trifolium repens cv. Haifa) and phalaris (Phalaris aquatica cv. Australian Commercial) was studied in an established mixed pasture under dryland (dry) or irrigated (wet) conditions. Soil water deficits under dry conditions reached 150 mm and soil water potentials in the top 20 cm declined to nearly -2 MPa after 50 days of dry weather. Water stress severely restricted growth of both species but then after rain fell, white clover growth rates exceeded those of phalaris. Under irrigation, white clover produced twice the herbage mass of phalaris but under dry conditions herbage production was similar from both species. Leaf appearance rates per tiller or stolon were slightly higher for white clover than phalaris but were reduced by 20% under water stress in both species. Leaf or petiole extension rates were more sensitive to water stress than leaf appearance rates and declined by 75% in phalaris and 90% in white clover. The ratio of leaf or petiole extension rates on dry/wet treatments was similar for both species in relation to leaf relative water contents, but in relation to leaf water potentials phalaris maintained higher leaf growth rates. Phalaris maintained a higher leaf relative water content in relation to leaf water potentials than did white clover and also maintained higher leaf water potentials in relation to the soil water potential in the top 20 cm. Stomata1 conductances for both species declined by 80-90% with increasing water stress, and both species showed similar stomatal responses to bulk leaf water potentials and leaf relative water contents. It is suggested that the poorer performance of white clover under water stress may be due principally to a shallower root system than phalaris and not due to any underlying major physiological differences. The white clover cultivar used in this study came from the mediterranean region and showed some different responses to water stress than previously published evidence on white clover. This suggests genetic variation in responses to water stress may exist within white clover. To maintain white clover in a pasture under dry conditions it is suggested that grazing practices aim to retain a high proportion of growing points.

scholarly journals Diverse responsiveness of dehydrin genes to abscisic acid and water stress treatments in cucumber F1 cultivar hybrids

2019 ◽  
Vol 94 (6) ◽  
pp. 726-734
Author(s):  
Anita Szegő ◽  
Eszter Badics ◽  
Dorottya Gubala ◽  
Réka Oszlányi ◽  
Bat-Erdene Oyuntogtokh ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Dehydrin Genes

Hydrogen peroxide and nitric oxide mediate K+/Na+ homeostasis and antioxidant defense in NaCl-stressed callus cells of two contrasting poplars

2010 ◽  
Vol 103 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Jian Sun ◽  
Lisi Li ◽  
Meiqin Liu ◽  
Meijuan Wang ◽  
Mingquan Ding ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Antioxidant Defense

Low concentrations of hydrogen peroxide activate the antioxidant defense system in human sperm cells

2015 ◽  
Vol 80 (9) ◽  
pp. 1178-1185 ◽  
Author(s):  
V. V. Evdokimov ◽  
K. V. Barinova ◽  
V. B. Turovetskii ◽  
V. I. Muronetz ◽  
E. V. Schmalhausen
Keyword(s):  
Hydrogen Peroxide ◽  
Antioxidant Defense ◽  
Human Sperm ◽  
Antioxidant Defense System ◽  
Sperm Cells ◽  
Defense System ◽  
Low Concentrations

Nitric Oxide-Mediated Modulation of Functional Iron Status in Iron-Deficient Maize Plants

2019 ◽  
Vol 5 (02) ◽  
pp. 78-83
Author(s):  
Rajesh Kumar Tewari
Keyword(s):  
Oxidative Stress ◽  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Antioxidant Defense ◽  
Zea Mays L ◽  
Iron Status ◽  
Leaf Tissue ◽  
Sod Activity ◽  
Iron Deficient ◽  
Maize Plants

Nitric oxide is reported to alleviate Fe-deficiency effects, possibly by enhancing the functional Fe status of plants. Study describes changes in leaf tissue Fe status and consequent modulation of oxidative stress and antioxidant defense in Fe-deficient maize (Zea mays L.) plants supplied with NO. Supply of sodium nitroprusside (SNP), but not of sodium ferrocyanide (SF), caused regreening of leaves, syntheses of chlorophylls and carotenoids and increased activities of hydrogen peroxide-scavenging heme-Fe enzymes and lipid peroxidation, decreased SOD activity and hydrogen peroxide concentration. Though SNP or SF appears to donate Fe and increase leaf active Fe, the later did not induce increases in chlorophyll and carotenoids, and therefore NO appears to have a role in Fe nutrition irrespective of total or active Fe status of plants.

scholarly journals Adaptation of Trifolium repens × T. uniflorum hybrid clovers to drought stress

2014 ◽  
Vol 76 ◽  
pp. 183-188
Author(s):  
Keith Widdup ◽  
Shirley Nichols ◽  
Warren Williams ◽  
Isabelle Verry ◽  
Ben Harvey
Keyword(s):  
Water Stress ◽  
Drought Resistance ◽  
White Clover ◽  
Trifolium Repens ◽  
Performance Indicator ◽  
Field Evaluation ◽  
Dry Weight ◽  
Moisture Stress ◽  
Backcross Generation ◽  
Shoot Dry Weight

Abstract White clover (Trifolium repens L.) is valued for its contribution to pasture quality and utilisation by animals, compatibility with grass, and fixation of nitrogen. However, it is limited by poor adaptation to drought. Hybridisation with Trifolium uniflorum L. may have potential to improve the drought resistance of white clover. An experiment in a rain shelter facility with contrasting moisture treatments, and a field evaluation under dryland conditions, were used to compare the agronomic potential of these interspecific hybrids (ISH) with white clover in moisture limited conditions. In the rain shelter experiment, there were smaller effects of water stress on shoot dry weight (DW), leaf area, internode length and senescence of first backcross generation hybrids compared with white clover and second backcross generation hybrids. Differences in photosynthetic responses were possibly influenced by the effect of root DW allocation on water uptake. In the field evaluation, growth scores of a wider range of hybrid families during summer moisture stress concurred with the results under water stress in the rain shelter. Growth of some ISH families outperformed the best white clover cultivars, particularly in the third and most stressful summer and this result was a key performance indicator of the value of the hybrids for drought prone areas. These findings using early, unselected, hybrid populations indicate the potential for further selection of elite, adapted cultivars from ISH breeding strategies. Keywords: Interspecific clover hybrid, drought resistance, rain shelter, field evaluation

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