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  • Author or Editor: Cyrus Samimy x
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Two-week-old `Ohio 8245' tomato (Lycopersicon esculentum Mill.) seedlings were subjected to physical impedance by placing a sheet of Plexiglas on the shoots for 15 hours a night for 12 consecutive nights. This treatment reduced stem length by 21% and increased stem diameter by 20% compared to nontreated plants. Stems of treated seedlings were considered sturdier than those of nontreated seedlings since the treated seedlings remained erect for 28 to 33 days after impedance ended and the stems of control seedlings did not. Forty-four days after impedance ended, stems of treated plants were 18% shorter and 9% thicker than those of nontreated plants. The results showed that tomato seedlings subjected to impedance developed growth characteristics that are desirable in transplants.

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Isozymes of six enzyme systems extracted from 13 apple (Malus domestica Borkh.) rootstocks were separated electrophoretically on a horizontal starch gel. Each rootstock was clearly distinguished by its unique isozyme banding patterns. All the rootstocks were distinguishable using only two of the enzyme systems, phosphoglucomutase and 6-phosphogluconate dehydrogenase, both of which exhibited considerable isozyme polymorphism.

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Deterioration of snap bean (Phaseolus vulgaris L.) seed quality during accelerated aging at 42°C and 100% relative humidity was accompanied by a decline in germination, radicle emergence, hypocotyl length, and ethylene production. Field emergence of 5 seed lots had a highly significant correlation with ethylene production rates when measured after 22 to 23.5 hours of imbibition at 25°. Seed lots that produced low levels of ethylene emerged poorly in the field. Results indicate that determination of ethylene production of imbibed seeds might be a useful method for detecting changes in seed vigor.

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