SELECTION IN SHADE-TOLERANT GENOTYPES OF TOMATOES
Chozin, Muhammad Ahmad
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Genetically, tomato traits may have different shade intolerances. Shade-tolerant tomatoes are potentially developed, for instance, for vegetable-agroforestry system. To obtain shade-tolerant tomatoes, a study on several tomato traits were evaluated on their morphological and physiological characteristics and their yields as responses to low light intensity. This experiment was conducted at farmer’s field Bogor in October 2014-February 2015 and used nested factorial design with three replications. Selection was conducted on 50 tomato genotypes cultivated under 50 and 100% light intensity. Variables to observe were leaf number and area; flower number, fruit number, fruit weight and production; flowering and harvesting time. The tolerance levels of tested genotypes were classified based on plant relative productivity rate. Methods used for statistical analysis were analysis of variance to differentiate between genotypes within response group; principle component analysis to define variance characters between genotypes; and cluster analysis and Euclidean distance method to determine relationship among tomato genotypes and its similarity level . The 50 genotypes under shading condition were classified into 5 shade-loving genotypes, 16 shade-tolerant genotypes, 14 shade-moderately-tolerant genotypes and 15 shade sensitive genotypes. Based on principal component analysis, the value of two principle components was 57.19%. The first principle component was plant production and reproduction with the value of 37.69%; and the second one was plant morphological characters with the value of 19.50%. The dendrogram from cluster analysis separated 50 genotypes to 3 clusters with a distance of 20. There were 7 genotypes in the first cluster, 11 genotypes in the second cluster; and 32 genotypes in the third cluster.