Water Content and Respiration Rate of Bean Cotyledons

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Abstract
The course of water uptake and respiration rate rise in cotyledons of Phaseolus vulgaris is divided into three phases. In the first phase lasting 10–16 hrs. respiration rate is controlled by water content; desiccation and reimbibition influence cotyledon water content and respiration rate alike and the changes are reversible; low temperature prevents water content rising above 50 per cent. and also limits respiration rate; both processes have Q10 near unity. The second phase lasting 3–8 hrs. is characterized by a pause in both water uptake and respiration rate rise. In the third phase respiration rate continues to rise until the fifth day, after which it falls steadily until eventually the cotyledons absciss. The period of rising respiration is one of metabolic activity, the rise having a high Q10 and being prevented by low temperature. Desiccation at this stage is irreversible.

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