JUNIPER PUBLISHERS-Nutrition & Food Science International Journal
Assessment of Salicylic Acid and Trehalose Impact on Root Growth and Water Relations in Relation to Grain Yield of Droughted Wheat Cultivars
Authored by Heshmat
S Aldesuquy*
Drought stress is a major constraint for crop production in
arid and semiarid regions. In this study, plant water status could be
considered as one of the most critical criteria not only determining but also
controlling the overall plant performance. Water stress greatly decreased root
biomass, root density and distribution. On the contrary, root length, number of
adventitious roots as well as root/shoot ratio was found to increase as a
result of drought stress. The inhibition of plant growth under water stress
conditions was intensively proved to be associated with altered plant-water
relations. Based on our results, we conclude that the drought exposure imposed
evident on root growth as well as plant water-relations. On the other hand, the
exogenous application of salicylic acid (SA), trehalose (Tre) or their
interaction appeared to mitigate this damage effect of drought with different
magnitude throughout counteracting the negative effects of water stress on all
growth criteria of root and improving leaf turgidity by decreasing the rate of
transpiration, increasing relative water content and decreasing saturation
water deficit as well as increasing water use efficiency for economic yield.
Grain yield was positively correlated with root fresh mass, root dry mass, root
density and root distribution. On the other hand, the grain yield was
negatively correlated with root length, root/shoot ratio and the number of
adventitious roots of both droughted wheat cultivars. Furthermore, Grain yield
positively correlated with transpiration rate, RWC, WUEG, WUEB, osmotic
pressure, total soluble sugars, proline, keto acids, citric acid and negatively
correlated with SWD, total soluble nitrogen as well as Na+and Cl-.
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