The plastochron index was used to compare the effects by daylength, mean temperature, and diurnal temperature fluctuation, on the rate of node development of five indeterminate common bean (Phaseolas vulgaris L.) genotypes grown in eight growth chamber environments. Regression analysis described temporal trends in the plastochron index. Regression curves for the various genotype—environment combinations were compared using canonical variates analysis. At a constant 17C, extending daylength from 12 to 14 or 16 hr had no effect on rate of node development. The rate of node development increased at a constant 23C when daylength was lengthened from 12 to 14 or 16 hr. The increase in rate of node development was more pronounced in genotypes with higher photoperiod sensitivity, as measured by delay of flowering. Temperature rise from 17 to 23 to 29C also increased the rate of node development, with genotypes again exhibiting differential response. Diurnal fluctuation of 6C about a mean of 23C had the same node development rate as a constant 23C.
K.S. Yourstone and D.H. Wallace
Chalita Sriladda, Heidi A. Kratsch, Steven R. Larson, and Roger K. Kjelgren
possible differences among species. Canonical variate analysis (CVA), performed with NTSYSpc 2.2N software (Exeter Software, Setauket, NY), was used to generate a model for the purpose of assigning field and existing herbarium specimens to one of four
Georges T. Dodds, J. Wyatt Brown, and Pamela M. Ludford
Chilling of mature-green (MG) tomato fruit (Lycopersicon esculentum Mill. and related species) was investigated to determine the effect of chilling stress on surface color during low-temperature storage. Color measurements were made with a tristimulus calorimeter (L, a, b values), and data were analyzed by multivariate analysis of variance and canonical variates analysis. Changes in surface color of MG fruit during chilling were not correlated overall with relative chilling sensitivity of cultivars/lines; however, within standard and cherry types, chilling-tolerant fruit changed surface color more during chilling than chilling-sensitive fruit when fruit were picked early in the season. Early harvests were less chilling-sensitive than late harvests. The number of hours below 15.6C in the 200 hours before harvest was positively correlated with postharvest chilling sensitivity. A high vs. ambient relative humidity during storage did not affect chilling-induced percent change in color. Tobacco mosaic virus resistance led to less and Verticillium albo-strum Reinke & Berthier resistance led to more chilling-induced color change. There was no effect from resistances to Fusarium oxysporum Schlechtend f. sp. lycopersici (Sacc.) W.C. Snyder & H.N. Hans, alternaria stem canker (Alternaria solani Sorauer), anthracnose [Colletotrichun coccodes (Wallr.) S.J. Hughes], root-knot nematode (Meloidogyne hapla Chitwood), Phytophthora infestans (Mont.) deBary, or Stemphylium botryosum f. sp. lycopersici Rotem, Cohen, & Wahl. Our results show harvest date had an effect on chilling-induced changes in surface-color in MG fruit.
Arsène Similien, Dennis A. Shannon, C. Wesley Wood, Edzard van Santen, Nirmal Joshee, and Wheeler G. Foshee
. 1 ) for the first two canonical variates revealed interesting patterns: 1) the four shade × irrigation groups clearly separated along CAN 1 in the order full sunlight without irrigation, full sunlight with irrigation, shade without irrigation, and
Alison L. Reeve, Patricia A. Skinkis, Amanda J. Vance, Katherine R. McLaughlin, Elizabeth Tomasino, Jungmin Lee, and Julie M. Tarara
separation between other wines, but overall, they were described as more green, earthy, buttery, and had an astringent mouthfeel. Fig. 4. Separation of the 2013 ‘Pinot noir’ wines based on canonical variate analysis by treatment scores ( A ) and sensory