Graduate Thesis Or Dissertation
 

Frost resistance of pea genotypes (Pisum sativum L.) grown in the field on ground level and raised beds, and under controlled laboratory conditions

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  • The effect of raised bed culture on winter survival of ten pea genotypes (Pisum sativum L.), differing in inherent cold hardiness and growth habit, was studied under two climatic conditions: a moist semi-maritime winter (Corvallis, Oregon) and a cold continental winter (Weston, Oregon). An assessment of winter injury was based on three indices: percent survival, plant weight, and a visually assigned damage rating. Varying percentages of seven genotypes survived at Corvallis and of six at Weston. Planting on raised beds at Corvallis significantly increased the mean percent survival and plant weight and decreased the mean damage rating. Of two Corvallis planting dates, September 18 and October 10, 1975, the latter had a significantly higher mean percent survival and a lower mean damage rating. At Weston, the mean percent survival was higher on ground level plantings. Plant weight was not affected by planting method. At this location there was a significant interaction between planting method and genotype. Of the six surviving genotypes only the two least hardy had significantly higher percent survival on ground level plantings. Controlled freezing tests between -2 and -10° C were conducted on four genotypes, AW, WH2, INTl, and S4, to determine their relative levels of inherent cold hardiness and cold acclimating ability. An electrolyte leaching method of determining the extent of freezing injury ranked the genotypes as follows, from most hardy to least: AW = WH2 > INTl > S4. A visual estimation of damage ranked the genotypes as follows: WH2 > AW > INTl > S4. In comparison, percent survival in the field studies ranked the four genotypes: AW > WH2 > INT1 > S4. Genotypes with a compact growth habit, AW and WH2, acclimated [less than or equal to] 4° C, whereas those with an upright growth habit, INTl and S4, acclimated 1-2° C.
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