Physiological Significance of Internal Water Relations to Crop Yield

Film antitranspirants increase yield in drought stressed wheat plants by maintaining high grain number

“…The WD treatment reduced grain yield in unsprayed plants by more than 40%, due to reduced grain number, which is similar to other reports on the effect of drought stress on yield reduction (Barnabas et al, 2008;Eastin et al, 1969;Ji et al, 2010). Similarly, reduced yield from the application of AT under WW conditions was expected, since the AT film decreases leaf permeability to carbon dioxide exchange thus decreasing the supply of assimilates available for developing floret growth (Das and Raghavendra, 1979;Davenport et al, 1974;Gale and Hagan, 1966).…”

Growth and Betacyanin Content of Beetroots (Beta vulgaris L.) Under Water Deficit in A Tropical Condition

“…A linear regression was found highly significant (P < 0.01) to describe the decrease of leaf RWC observed on day 44 with the increase of watering intervals (Fig. 1) An attempt was made to estimate leaf water potential as a function of leaf RWC based on Höfler diagram (Slatyer, 1969) to envisage the level of water stress ensued in plants. The estimated water potential of leaves varied from -0.1 MPa to -2.3 MPa suggesting that most plants have experienced water stress after 16 days of the treatment imposition (Fig.…”

“…2). Leaf water potential at wilting point is commonly considered at -1.5 MPa (de Oliveira, Ramos, & de Aquino, 2015;Slatyer, 1969), but was reported to vary between tree species and growth stages in a recent study (Maréchaux, Bartlett, Gaucher, Sack, & Chave, 2016). In potato grown in pots in a growth chamber, leaf RWC of plants after three weeks varied considerably between cultivars in the range of 64.4-86.7% (Soltys-Kalina, Plich, Strzelczyk-Żyta, Śliwka, & Marczewski, 2016).…”

“…Each point represents the mean of five replicates, and vertical bars represent the standard error of the mean The estimated leaf water potential (LWP) as a function of RWC of leaves. The graph is a hand-made graph based on Höfler digram(Slatyer, 1969) Copyright © 2019 Universitas Brawijaya…”

Effect of Planting Date , Irrigation Level and Foliar Spraying With Calcium and Boron Treatments on Potato 1. Plant Growth , Plant Water Relationship and Plant Chemical Constituents

“…The increase in vegetative growth of potato plant by increasing irrigation water quantity might be due to that irrigation at 100 % from FC resulted in lower stomata resistance, and hence higher conductance and photosynthetic activity. On the other hand, unfavorable effect of drought on dry matter production might be due to the reduction in uptake of nutritional elements that cause a disturbance in the physiological processes needed for plant growth (Slatyer, 1969) and or to the reduction in leaf area and photosynthetic rate (Fisher and Hagan, 1965) and/or to that low water level also caused reduction in CO 2 assimilation due to stomata close (Hsiao and Acevedo, 1974), and/or to that the photosynthetic efficiency began to decrease with a slight deficit in the soil moisture content due to the decrease in the mesophyll photosynthetic activity at high xylem water potential (Gawish, 1992).…”