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UPPER EXPOSED PEDUNCLE LENGTH VARIATION STUDIES IN WHEAT CULTIVARS IN RESPONSE TO HEAT STRESS AT VARIED SOWING TIMES

Wheat is the very important source of food all around the world. In the present changing climate scenario, environmental temperature is increasing day by day due to global warming. Heat stress cause severe yield loss by impairing normal morphological, physiological, biochemical and molecular functions and thus possess the biggest threat to world food security. So, it is important to consider all the contributing factors to develop wheat varieties with better heat stress tolerance attributes. The peduncle length is very less explored yet very important yield contributing factor which may be very important in understanding the plant response and adaptation to the heat stress. Peduncle especially its upper exposed part exhibit important role in storage and mobilization of photosynthetic reserve to the developing wheat grains and thus has important impact on wheat yield. In the present study, we have studied the variations in length of upper exposed part of peduncle or PL(Ue) of eight wheat cultivars under heat stress (+ 5oC up than control conditions) for different dates of sowing, i.e. DOS1 timely sown (TS), November 24, 2016; late sown (LS), December 24, 2016; DOS3 very late sown (VLS) January 24, 2017 and very-vey late sown conditions (VVLS), February 24, 2017 in the crop year 2016-17. The present study can provide an idea about the morphological variations in comparatively less explored trait like peduncle length (upper exposed part) under heat stress which further can be utilized in understanding the effects of heat stress on wheat and thus help in breeding programmes involved in heat stress tolerance.