The leaf curl disease of tomato (
Solanum lycopersicum
L.) caused by
tomato leaf curl virus
(ToLCV) poses a serious production constraint throughout the world. An evaluation for resistance to ToLCV ...and four horticultural traits was carried out using 10 parents and 45 F
1
hybrids during the autumn of 2014–2015. Screening against ToLCV was done under both induced natural disease conditions and whitefly (
Bemisia tabaci
Genn.)-mediated inoculation, with symptoms ranging from symptomless to very severe infection. Under the natural disease conditions, seven parents and 20 F
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hybrids appeared symptomless until the fruit maturation stage. Using the artificial inoculation technique, six parents and 18 hybrids showed resistance at 60 days post inoculation. The correlation coefficients indicated that breeding for ToLCV-resistant hybrids enhanced total yield, fruit weight and total soluble solids content of fruits under natural disease conditions. Based on screening for resistance to ToLCV and four horticultural traits, we identified 4 tomato hybrids, namely CLN 138A × CLN 138B, CLN 138B × PVB-1, CLN 104 × CLN 154 and CLN 17 × PVB-1 to be favorable for commercial use. These hybrids showed resistance after undergoing the whitefly-mediated inoculation, produced 40% higher yield, and were either superior or at par for fruit weight, TSS and lycopene content when compared to the commercial control under natural disease conditions.
Comparison of three barley genotypes, two parentale, Onice and Georgie, and their F
1
offspring, were made for protein synthesis modification upon exposure to high temperature. The two parentals ...showed different degree of thermotolerance and different sets of hsp's (heat shock proteins) induced. The F
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progeny showed high similarity with the winter type Onice. The relation between hsp's pattern and different stages of development was assessed by analysis of in Wira translation products of hs (heat shock) mRNAs from shoots and leaves of "Georgie". The conclusions are that: 1) there is genotypic specificity in hsp induction that should be used to study inheritance of hsp's in the progeny; 2) there is a developmentally related regulation of hs genes.
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