Journal of Taiwan Agricultural Research

Author:Shao-Kuo Liu and Guang-Jauh Shieh*

Abstract:

    A feld study was conducted to determine relationship between agronomic traits and yields in dif-ferent varieties of super sweet corn in Taiwan.  Fourteen varieties of super sweet corn and a half-diallel set (14 × 14) of crossing hybrids from tropical type and temperate types were planted in the feld to compare ten agronomic traits, including days to tasseling, days to silking, plant height, ear height, stalk diameter, number of leaves per plant, leaf area per plant, ear weight with husk, and ear fresh weight and ear length.  Result of ANOVA showed that leaf area among different varieties had signifcant difference, and other traits also had high signifcant difference among fourteen varieties.  When the ten agronomic traits were compared, mean of the phenotypic characters were signifcantly lower in the eleven varietes belonging to temperate types than in the three varieties belonging to tropical types.  Results of cluster analysis by UPGMA method showed that the fourteen varieties were classifed into two groups.  The frst group included three tropical types varieties.  PH 10, Bright Jean and PH 5, with Bright Jean and PH 5 as frst subgroup, and PH 10 as second subgroup.  The second group included eleven temperate type varieties.  Golden Honey, Sin Ji Shih 600, Hao Zih Wei, Honey 236, Sinon No. 3, Honey Jean No. 2, Sinon No. 2, Sinon No. 123, Shen Nong 135, Sinon No. 506 and Venus.  The second group was further divided into two subgroup, the varieties Sin Ji Shih 600, Hao Zih Wei and Sinon No. 2 belonged tothefrst with very early maturity, and the varieties Golden Honey, Honey 236, Sinon No. 3, Honey Jean No. 2, Sinon No. 123, Shen Nong 135, Sinon No. 506 and Venus belonged to the second subgroup with early maturity.  Correlation coeffcient between ear fresh weight and Euclidean distance was signifcant (r = 0.75).  The results suggest that Euclidean distance of the agronomic traits is a useful tool to evaluation of performance of ear fresh weight in hybrids of super sweet corn.

Key words:Super sweet corn, Tropical type, Temperate type, Genetic distance

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