The Changes in Yield Response Factor, Water Use Efficiency, and Physiology of Sunflower Owing to Ascorbic and Citric Acids Application Under Mild Deficit Irrigation

Hani S. Saudy, Mohamed E. El-Bially, Fadl A. Hashem, Mostafa G. Shahin, El-Gabry, Yasser,

Abstract


Under arid and semi-arid climates, adopting the appropriate tools for alleviating water deficit impacts is a critical factor
that affects the physiological characteristics and yield of sunflower. Therefore, in order to find promising field practices in
sunflower cultivation, the strip plots design in randomized complete block arrangement was used to examine the effects
of two irrigation regimes as 100% (FI) and 85% (DI) of crop evapotranspiration and five antioxidant treatments on
physiological and agronomic traits, yield response factor, and irrigation water use efficiency (IWUE) of sunflower. The
antioxidant treatments involved two rates of ascorbic acid (150 and 300mg L–1) and two rates of citric acid (250 and
500mg L–1), in addition to the check treatment (tap water). The study was conducted for two growing seasons of 2019 and
2020 at the Experimental Farm of Ain Shams University, Egypt, located in a semi-arid environment. Findings showed that
exogenous application of higher rate of ascorbic acid, i.e. 300mg L–1 with FI exhibited the highest increase of chlorophyll a,
chlorophyll b and the lowest proline content compared to other interaction treatments. Seed yield was significantly higher
with FI plus ascorbic acid 300mg L–1 and DI plus ascorbic acid 300mg L–1 treatments than with their counterpart check
treatment in both growing seasons. Under DI, IWUE was improved with antioxidant-treated plants compared to untreated
plants. Yield response factor as an indicator of crop tolerance to drought was higher than the unit (>1) under all ascorbic
acid and citric acid levels. It could be concluded that ascorbic acid and citric acids partially mitigated the reductions in
growth and yield caused by low water supply. However, yield response factor demonstrated that the crop is still sensitive
to drought. Thus, other applicable patterns should be adopted to increase the yield potential of sunflower for counteracting
the adverse impacts of drought.


Other data

Title The Changes in Yield Response Factor, Water Use Efficiency, and Physiology of Sunflower Owing to Ascorbic and Citric Acids Application Under Mild Deficit Irrigation
Authors Hani S. Saudy; Mohamed E. El-Bially; Fadl A. Hashem; Mostafa G. Shahin; El-Gabry, Yasser 
Keywords Anti-stress agents;Drought;Oil yield;Oxidative stress;Plant pigments;Sunflower productivity
Issue Date 17-Aug-2022
Journal Springer 
DOI https://doi.org/10.1007/s10343-022-00736-w

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