Stomatal aperture rather than nitrogen nutrition determined water use efficiency of tomato plants under nitrogen fertigation

Wang, Chao; Wu, Siqi; Tankari, Moussa; Zhang, Ximei; Li, Li; Gong, Daozhi; Hao, Weiping; Zhang, Yanqing; Mei, Xurong; Wang, Yufei; Liu, Fulai; Wang, Yaosheng

doi:10.1016/j.agwat.2018.07.020

Cited by 40 publications

(28 citation statements)

References 65 publications

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“…Irrigation at 70%ET c recorded further significant increases in WUE. These results agree with those obtained by Tahi et al (2007) and Wang et al (2018). Spraying plants with Si increased WUE significantly.…”

Section: Total Chlorophyllsupporting

confidence: 92%

The effect of Si on minimizing the implications of water stress on tomato plants

Aziz¹

2020

EBSS

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W ATER scarcity is a global issue especially in arid regions and rationalizing the use of fresh irrigation water has become necessary to satisfy water needs. The current study investigates using Si to alleviate the implications of water stress on tomato plants grown on a light textured soil. A split-plot experiment was conducted under the field conditions for two successive seasons (2017 and 2018) on tomato under two deficit irrigation levels i.e. 70 and 85% ET c as well as 100% ETc for comparison. Plants were subjected to two levels of silica foliar spray (0 and 0.4 mM). At physiological maturity growth stage, chemical characteristics of tomato fruits as well as total fruit yield were determined. Deficit irrigation decreased contents of chlorophyll A and B in leaves; while increased proline content in plant roots. This consequently decreased tomato fruit yield; while, raised its contents of total dissolved solids and vitamin C. On the other hand, spraying plants with Si raised significantly chlorophyll A and B in leaves and alleviated plant stress by increasing proline content in roots. This increased significantly fruit yield. Irrigation with 85% Et c with Si spray recorded a rather similar fruit yield to those irrigated with 100% Et c. Moreover, Si treatments increased significantly water use efficiency by the crop. Thus, Si spray can take part in saving considered amounts of water that can be used for irrigation of further tomato areas.

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Section: Total Chlorophyllsupporting

confidence: 92%

The effect of Si on minimizing the implications of water stress on tomato plants

Aziz¹

2020

EBSS

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“…Drought and salinity stress showed the same effect on enhancing WUE at leaf scale in the present study ( Table 1). The positive effect of drought and salinity on WUE -leaf is largely due to leaf stomatal closure and transpiration rate reduction under the external stress [53,54], thus leads to water evaporation less and water use more efficiency for the leaf. However, at the yield scale, WUE -yield was enhanced significantly by drought stress but decreased significantly by salinity stress.…”

Section: Discussionmentioning

confidence: 99%

Biochar addition alleviate the negative effects of drought and salinity stress on soybean productivity and water use efficiency

et al. 2020

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Background: Environmental stress is a crucial factor restricting plant growth as well as crop productivity, thus influencing the agricultural sustainability. Biochar addition is proposed as an effective management to improve crop performance. However, there were few studies focused on the effect of biochar addition on crop growth and productivity under interactive effect of abiotic stress (e.g., drought and salinity). This study was conducted with a pot experiment to investigate the interaction effects of drought and salinity stress on soybean yield, leaf gaseous exchange and water use efficiency (WUE) under biochar addition. Results: Drought and salinity stress significantly depressed soybean phenology (e.g. flowering time) and all the leaf gas exchange parameters, but had inconsistent effects on soybean root growth and WUE at leaf and yield levels. Salinity stress significantly decreased photosynthetic rate, stomatal conductance, intercellular CO 2 concentration and transpiration rate by 20.7, 26.3, 10.5 and 27.2%, respectively. Lower biomass production and grain yield were probably due to the restrained photosynthesis under drought and salinity stress. Biochar addition significantly enhanced soybean grain yield by 3.1-14.8%. Drought stress and biochar addition significantly increased WUE-yield by 27.5 and 15.6%, respectively, while salinity stress significantly decreased WUE-yield by 24.2%. Drought and salinity stress showed some negative interactions on soybean productivity and leaf gaseous exchange. But biochar addition alleviate the negative effects on soybean productivity and water use efficiency under drought and salinity stress. Conclusions: The results of the present study indicated that drought and salinity stress could significantly depress soybean growth and productivity. There exist interactive effects of drought and salinity stress on soybean productivity and water use efficiency, while we could employ biochar to alleviate the negative effects. We should consider the interactive effects of different abiotic restriction factors on crop growth thus for sustainable agriculture in the future.

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“…Leaf area was measured with a leaf area meter (model 3050A, Li-Cor Biosciences, NB, USA). Root samples were collected according to the method described by Wang et al (2018). Leaf and root water potential was measured by a Dewpoint PotentioMeter (model WP4C, Meter Group Inc., WA, USA).…”

Section: Sampling Measurements and Analysismentioning

confidence: 99%

Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants

Xing

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: Water and nitrogen (N) are essential resources influencing plant growth and yield. To improve their efficiencies in crop production is challenging because the physiological mechanisms of water and N coupling and their interactive effect on crop water use efficiency (WUE) are not well understood yet. Aim: The aim of this study was to investigate the physiological responses and phytohormones signaling in oats in response to soil water status and N supply under fertigation, to explore the mechanisms regulating plant growth and WUE. Methods: Oat plants were subjected to the factorial combination of three soil moisture regimes (50, 70, and 90% of soil water holding capacity, SWHC) and three N levels (fertilized with 74, 149, and 298 mg kg-1). Results: The stomatal conductance (g s) was significantly decreased by soil water deficit, and also by the highest N level, whereas photosynthesis rate (A n) was unaffected by neither water nor N. Consequently, intrinsic WUE (WUE int , A n /g s) was highest under reduced irrigation and high N fertilization. This effect at stomatal level was affirmed by responses in whole plant WUE (WUE b), which was positively correlated with shoot δ 13 C. A positive correlation between δ 18 O and δ 13 C in shoots further indicated that decreases of g s rather than changes in A n contributed to the enhanced WUE. Conclusion: Moderate soil water deficit and sufficient N supply is recommended for saving irrigation water and improving WUE on fertigated oat plants without compromising biomass accumulation to any large extent.

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Stomatal aperture rather than nitrogen nutrition determined water use efficiency of tomato plants under nitrogen fertigation

Cited by 40 publications

References 65 publications

The effect of Si on minimizing the implications of water stress on tomato plants

The effect of Si on minimizing the implications of water stress on tomato plants

Biochar addition alleviate the negative effects of drought and salinity stress on soybean productivity and water use efficiency

Effects of water deficit and nitrogen application on leaf gas exchange, phytohormone signaling, biomass and water use efficiency of oat plants

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