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- Author or Editor: G. J. Hoffman x
Paper chromatograms of flavonoid compounds extracted from the leaves of 43 snap bean cultivars and breeding lines produced characteristic patterns which allowed all but 7 to be classified into one of 3 major categories. One of the flavonoid compounds was consistently associated with bush and not runner type plants and was thus useful for early classification of populations segregating for plant type. The high degree of similarity among cultivars for a set of characters which one might expect to be distributed at random suggests a rather narrow gene base for this crop.
The salt tolerance of cultivars of muskmelon (Cucumis melo, L.) was established under 2 levels of radiation in a glasshouse experiment. ‘Galia’ and ‘Top Mark’ muskmelon differed very little in salt tolerance at either radiation level. The maximum electrical conductivity of a saturated soil extract without yield reduction, the salt tolerance threshold, was 2.0 dS m−1. Beyond the threshold, yield was reduced at a rate of 14.3% per unit increase in soil salinity. Both cultivars were more salt-tolerant at the higher level of solar radiation.