Variation on Photosynthetic Performance in Kiwifruit Seedling During Drought Stress and Rewatering

Abstract

Abstract. Drought stress adversely impact on the global crop growth and productivity. It is especially important to elucidate the physiological characteristics on plants under drought stress. With the prolongation of drought time, chlorophyll content continued to decline. Root activity increased significantly in mild and moderate drought periods, rapid decline in severe drought period; leaf net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and photochemical efficiency (ФPSⅡ) decreased significantly with the increase of drought, while the intercellular CO2 concentration increased significantly. After 7 days of rehydration, there were different degrees of recovery. In mild and moderate drought periods, 'Hong yang' kiwifruit were resistant to drought by reducing the photosynthetic rate.

Effects of Short-Term High Temperature on Gas Exchange in Kiwifruits (Actinidia spp.)

“…In another study, Zhang et al [ 32 ] also demonstrated that the root activity of A. chinensis cv. ‘Hongyang’ increased significantly in mild and moderate drought periods and rapidly declined in severe drought periods; the leaf net photosynthetic rate, transpiration rate, stomatal conductance and photochemical efficiency decreased significantly with increasing drought, while the intercellular CO 2 concentration increased significantly.…”

Challenges Associated with a Successful Management of Regulated Deficit Irrigation in Commercial Fresh-Fruit Production

“…This is why RDI has been mostly employed in fruit crops whose economic value is not determined by fresh weight, such as wine grapes [3], almonds [5], and prunes [6], among others. Furthermore, the fact that fresh-fruit growers have been hesitant to use this irrigation technique [7] is a good example of how the adoption of water conservative irrigation strategies, is strongly hindered by farmer's aversion to risk [8]. The implementation of successful RDI in fruit orchards must include several key points that are not always properly considered.…”

“…Chev.) may exhibit very high stomatal conductance [8], which explains the high vulnerability of kiwifruit to cavitation. On the other hand, leaves from highbush blueberry plants (Vaccinium corymbosum L.) have been reported to show an exponential reduction in stomatal conductance as water stress severity increases [9].…”