Abstract
The present research was carried out to determine water-stress tolerance of linoleic sunflower genotypes (P64LE119, PR63F73, P64LL62) grown under different water stress conditions [no water-stress (I100); mild water-stress (I70); strong water-stress (I35)] in the years 2015 and 2016. Variance analyses revealed significant differences between the genotypes (P<0.01). As the average of two years, the greatest yield was obtained from no water-stress x genotype interaction (I100xP64LE119) with 4094.66 kg ha-1, the lowest yield was obtained from strong water stress x genotype interaction (I35xPR63F73) with 2487.81 kg ha-1. Again as the average of two years, the greatest chlorophyll content was obtained from no water-stress x genotype interaction (I100xP64LE119) with 49.83 spad, the lowest value was obtained from strong water stress x genotype interaction (I35xPR63F73) with 34.39 spad. The greatest crop water stress index was obtained from strong water stress x genotype interaction (I35xPR63F73) with 0.53, the lowest value was obtained from no water-stress x genotype interaction (I100xP64LE119) with 0.21. The P64LE119 genotype with optimum water use efficiency and prominent with crop water stress index and chlorophyll content both in no water-stress and strong water stress treatments was identified as water stress-resistant and the genotype was considered to have reliable characteristics potentially to be used in further water stress-resistance studies.
Highlights
Today, agronomists and plant breeders are focused on yields rather than survival of the plants
Correlation analyses revealed that yield positively correlated with chlorophyll content (CC) (86%), water use efficiency (WUE) (74%) and soil moisture content (61%) (P
As the average of two years, the greatest yield was obtained from I100xP64LE119 interaction (4094.66 kg ha-1) and the lowest yield was obtained from I35xPR63F73 interaction (2487.81 kg ha-1)
Summary
Agronomists and plant breeders are focused on yields rather than survival of the plants. Recent global warminginduced abiotic stressors have negatively influenced agricultural production activities and such impacts compelled the researchers to take new measures against the negative impacts of climate change and resultant global warming. Water stress, insufficient nutrition, salinity and high temperature are the leading ones (Kozlowski & Pallardy 1997). Recession in plant growth due to deficit moisture within the plant efficient root zone (through the soil profile of 0-90 cm) is defined as water stress. The initial symptoms of water stress realize at stomatal level and stomas close to prevent further moisture loss through transpiration (Flexas & Medrano 2002). Stomal closure reduces CO2 availability in chloroplasts and negatively influences net photosynthesis rates
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