Carbohydrate requirements for dark respiration by peach vegetative organs.
1994
Grossman Y.L. | DeJong T.M.
The specific respiration rate at 20 degrees C (R20) of peach leaves and stems, declined rapidly from a high value in the early spring (22.5 nmol CO2 gdw(-1)s-1) to relatively constant rates by July (3.1 nmol CO2 gdw(-1) s(-1). Leaf declined more rapidly than current-year stem R20, but leaf and current-year stem R20S were similar by July. The R20 current-year stems in July was approximately 2.5 times greater than that of one-year-old stems (1.3 nmol CO2 gdw(-1)(s-1), and about 30 times greater than that of the trunk R20S (0.1 nmol CO2 gdw(-1)s(-1)). The Q10S of leaves and stems were approximately 2 for a temperature increase between 20 and 30. The Q10S above 30 were 2.03 for leaves but only 1.61 for stems. Leaves and current-year stems accounted for 2 and 17% of the aboveground vegetative biomass in April and August, respectively, but accounted for 59-80% of total daily (24 h) respiration. Although trunk biomass accounted for 91 and 77% of aboveground vegetative biomass, in April and August, respectively, trunk respiration accounted for only 8-15% of daily aboveground respiration. Before harvest, during a period when fruit growth was source-limited, daily fruit respiration exceeded respiration by all aboveground vegetative organs.
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