scholarly journals Ascorbic acid mitigation of water stress-inhibition of root growth in association with oxidative defense in tall fescue (Festuca arundinacea Schreb.)

2015 ◽  
Vol 6 ◽  
Author(s):  
Yi Xu ◽  
Qian Xu ◽  
Bingru Huang
Keyword(s):  
Ascorbic Acid ◽  
Water Stress ◽  
Root Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Oxidative Defense

Purple Nutsedge Control in Turfgrasses by S-21634

Weed Science ◽  
1974 ◽  
Vol 22 (6) ◽  
pp. 549-552 ◽  
Author(s):  
B. J. Johnson
Keyword(s):  
Root Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Cyperus Rotundus ◽  
Zoysia Japonica ◽  
Purple Nutsedge ◽  
Stenotaphrum Secundatum ◽  
Eremochloa Ophiuroides

Field and greenhouse studies were conducted on S-21634 (1-methyl-4-phenylpyridinium chloride) for control of purple nutsedge (Cyperus rotundusL.) and tolerance of several turfgrass varieties and species. Purple nutsedge was controlled during the initial year of treatment with single applications of 3.4 and 5.6 kg/ha rates. All turfgrasses were injured following treatments, however, all except centipedegrass[Eremochloa ophiuroides(Munro) Hack.] had recovered in 7 to 8 weeks. In general, the injury to centipedegrass was higher and the turf density was lower in the treated plots at the final ratings. None of the treatments applied as a single S-21634 application affected root growth of bermudagrass (Cynodonsp.), ‘Emerald zoysia’ (Zoysia japonicaxZ. teniuflolia), centipedegrass, St. Augustine grass [Stenotaphrum secundatum(Walt.) Kuntze], or tall fescue (Festuca arundinaceaSchreb, ‘Ky 31′).

INFLUENCE OF WATER STRESS CONDITIONING ON PHOTOSYNTHETIC WATER STRESS RESPONSE OF SWITCHGRASS (PANICUM VIRGATUM L.) AND TALL FESCUE (FESTUCA ARUNDINACEA SCHREB.)

2001 ◽  
Vol 49 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Z. Kiss ◽  
D. D. Wolf
Keyword(s):  
Water Stress ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Panicum Virgatum ◽  
Leaf Water ◽  
Panicum Virgatum L ◽  
Influence Of Water ◽  
Stress Cycles

The objective of this study was to investigate the influence of water stress conditioning on the photosynthesis response of switchgrass (Panicum virgatum L.) and tall fescue (Festuca arundinacea Schreb.) to moisture deficiency. Tillers of the two species were grown in the same, controlled, environment and were subjected to three conditioning water stress cycles, or were kept well watered. After drought conditioning all plants were subjected to moisture deficiency while photosynthesis and leaf water potential were monitored. Measurements were taken between –0.8 and –4.0 MPa and the rate of water stress was 0.49 MPa/day. The conditioning of switchgrass produced a 26% reduction in the photosynthesis rate during drought, while that of tall fescue produced a 57% reduction in photosynthesis. Both species maintained elongation and photosynthesis down to lower leaf water potentials after drought conditioning than before conditioning. The conditioning water stress cycles decreased the leaf conductance, mesophyll resistance and transpiration of tall fescue plants after rewatering. The leaf water potential of conditioned switchgrass plants was lower upon rewatering after three conditioning water stress cycles than the leaf water potential of non-conditioned plants, while the leaf conductance, mesophyll resistance and transpiration of conditioned and non-conditioned tillers were equal. These data indicate an improvement in the drought tolerance of tall fescue and switchgrass plants, emphasize the importance of knowing the previous water stress history of the plants in moisture deficiency experiments, and help to choose proper irrigation management for switchgrass and tall fescue.

scholarly journals Exogenously Applied Ascorbic Acid-Mediated Changes in Osmoprotection and Oxidative Defense System Enhanced Water Stress Tolerance in Different Cultivars of Safflower (Carthamus tinctorious L.)

Plants ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 104 ◽  
Author(s):  
Farooq ◽  
Bukhari ◽  
Akram ◽  
Ashraf ◽  
Wijaya ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Water Stress ◽  
Water Deficit ◽  
Total Phenolics ◽  
Field Capacity ◽  
Soluble Proteins ◽  
Defense System ◽  
Oxidative Defense ◽  
Chlorophyll Contents ◽  
Water Stress Tolerance

The present study was conducted to examine the effect of exogenously applied ascorbic acid (AsA) on osmoprotectants and the oxidative defense system in four cultivars (16171, 16183, 16207 and 16246) of safflower under well-watered and water deficit conditions. Water stress (60% field capacity) significantly decreased the shoot and root fresh and dry weights, shoot and root lengths and chlorophyll contents in all four safflower cultivars, while it increased the leaf free proline, total phenolics, total soluble proteins, hydrogen peroxide content and activities of catalase, superoxide dismutase and peroxidase enzymes. Foliar-applied (100 mg L−1 and 150 mg L−1) ascorbic acid caused a marked improvement in shoot and root fresh and dry weights, plant height, chlorophyll and AsA contents as well as the activity of peroxidase (POD) enzyme particularly under water deficit conditions. It also increased the accumulation of leaf proline, total phenolics, total soluble proteins and glycine betaine (GB) content in all four cultivars. Exogenously applied AsA lowered the contents of MDA and H2O2, and the activities of CAT and SOD enzymes. Overall, exogenously applied AsA had a positive effect on the growth of safflower plants under water deficit conditions which could be related to AsA-induced enhanced osmoprotection and regulation of antioxidant defense system.

Factors Influencing the Survival of Propagules of Tall Fescue (Festuca arundinacea Schreb.)

1966 ◽  
Vol 2 (3) ◽  
pp. 239-244
Author(s):  
J. E. Miltimore
Keyword(s):  
Root Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Leaf Growth ◽  
Limited Range ◽  
Root Weight ◽  
Broad Sense Heritability ◽  
Weight Growth ◽  
Factors Influencing ◽  
Individual Parent

SUMMARYPropagules of 74 genotypes of tall fescue, consisting of parent and progeny groups, were grown in a glasshouse. The number of surviving propagules were determined after one month and at that time, increment weight (growth) and leaf and root weights were determined. Broad-sense heritability estimates were calculated on the whole population and on two individual parent and progeny groups. The criteria measured varied in heritability between groups, but for the 74 genotypes the values had a more limited range from 57 per cent for root weight to 70 per cent for increment weight. Capacity to survive vegetative propagation was dependent on leaf growth and not on root growth or size of propagule. Because of the variation in survival, this characteristic warrants consideration in a selection program where propagation will be utilized for commercial purposes.

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