How Much and When to Irrigate the Crops Using Water Content Reflectometer

Montiel, Marynés; Peña, Esteban Peña; Chávez, y A.

doi:10.13031/2013.8424

Cited by 1 publication

(2 citation statements)

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“…TW occurred with prolonged soil drying in the present experiment. Montiel et al (2002) have found TW point as an indicator of when and how much water to be applied to a crop. However, in the present study, by analyzing the biochemical changes in the leaf at the start of TW, we found that the ABA content at TW reached the highest level during the drying period and was higher in the old variety than in the modern ones.…”

Section: Discussionmentioning

confidence: 99%

“…As water deficits becomes severe by withholding water, temporary wilting (TW) can occur in any soil when the atmospheric water demand exceeds the water uptake by plant from the soil, characterized by drooping of leaves during the day and rehydration and recovery at night. As proposed by Montiel et al (2002), TW point is an indicator of when and how much water should be applied to a crop. However, more physiological and biochemical aspects of TW point need to be concerned.…”

Section: Introductionmentioning

confidence: 99%

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Defense strategy of old and modern spring wheat varieties during soil drying

Fan

Song

et al. 2009

Physiologia Plantarum

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Different defense mechanisms of three spring wheat (Triticum aestivum L.) varieties were studied by withholding watering in well-watered pots to gradually increase water deficit of plants grown in containers. The strategies of plant adaptation were divided into three phases according to the severity of drought: first, a positive defense phase that started from commencement of non-hydraulic root-sourced signals (nHRS) and ended at onset of hydraulic root-sourced signals (HRS)--the plant responded to imminent drought by decreasing stomatal aperture to lessen water loss and no membrane injury occurred. The second defense phase occurred between the onset of HRS and temporary wilting (TW), characterized by enhancement of reactive oxygen species (ROS), marked enzyme activity and increased MDA content. Mild lipid membrane peroxidation came mainly from a dynamic imbalance between free radical production and enzymatic defense reaction, which indicated that injury by ROS had not been completely repaired by increasing enzymatic activity. The third defense phase was from TW to permanent wilting (PW), the synthesis of SOD and CAT during TW could not deal with the collapse of antioxidant enzymes, and SOD and CAT activities began to decrease, which caused the excessive ROS production and thus serious membrane lipid peroxidation. The defense strategies to drought are similar among the varieties, but modern varieties LC8275 and GY602 bred after 1975 had relatively higher defense levels at all three defense phases, which suggest that modern varieties are more resistant than old ones, and artificial selection would lead to a different direction in evolution from natural selection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%