Abstract:

Growth in diameter of the fig (Ficus carica L. cv. Mission) fruit takes place in three distinct periods; two periods (I and III) of rapid growth are separated by a period (II) of slow growth. With respect to exposure to ethylene, the fruit exhibits a two phase response. Ethylene inhibits fruit growth in phase A (period I), the period of cell division, stimulates growth in early phase B (early period II), and stimulates both growth and ripening during the remainder of phase B (late period II and period III). The adverse effect of exogenous ethylene on fruits during phase A is thought to be due to inhibition of cell division. The gradual transition occurring in the response of fruits during phase B was interpreted in terms of carbohydrate level in the fruits.The onset of period III and a respiratory climacteric rise was preceded by or concomitant with a sudden burst of endogenous ethylene synthesis. This, together with the fact that exogenous ethylene applied at the proper stage of fruit growth triggers both ripening and the climacteric rise, leads to the conclusion that ethylene is the causal agent. In other words, the data support the concept that ethylene is a growth hormone that initiates a chain of metabolic and physiological events leading to fig fruit ripening.

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Growth and Respiratory Response of Fig (<em>Ficus carica</em> L. cv. Mission) Fruits to Ethylene <sup><a href="#fn1" rid="fn1" class=" fn">1</a></sup>

N Marei

J Crane

Abstract

Growth in diameter of the fig (Ficus carica L. cv. Mission) fruit takes place in three distinct periods; two periods (I and III) of rapid growth are separated by a period (II) of slow growth. With respect to exposure to ethylene, the fruit exhibits a two phase response. Ethylene inhibits fruit growth in phase A (period I), the period of cell division, stimulates growth in early phase B (early period II), and stimulates both growth and ripening during the remainder of phase B (late period II and period III). The adverse effect of exogenous ethylene on fruits during phase A is thought to be due to inhibition of cell division. The gradual transition occurring in the response of fruits during phase B was interpreted in terms of carbohydrate level in the fruits.

The onset of period III and a respiratory climacteric rise was preceded by or concomitant with a sudden burst of endogenous ethylene synthesis. This, together with the fact that exogenous ethylene applied at the proper stage of fruit growth triggers both ripening and the climacteric rise, leads to the conclusion that ethylene is the causal agent. In other words, the data support the concept that ethylene is a growth hormone that initiates a chain of metabolic and physiological events leading to fig fruit ripening.

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Selected References

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^{Department of Pomology, University of California, Davis, California 95616}

^{Permanent address: Department of Horticulture, Faculty of Agriculture, Ain-Shams University, Cairo, Egypt (U.A.R.).}

^{This work was supported by the Faculty of Agriculture, Ain-Shams University, Cairo, Egypt (U.A.R.) and by National Science Foundation Grant GB-8545.}

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Abstract

Growth in diameter of the fig (Ficus carica L. cv. Mission) fruit takes place in three distinct periods; two periods (I and III) of rapid growth are separated by a period (II) of slow growth. With respect to exposure to ethylene, the fruit exhibits a two phase response. Ethylene inhibits fruit growth in phase A (period I), the period of cell division, stimulates growth in early phase B (early period II), and stimulates both growth and ripening during the remainder of phase B (late period II and period III). The adverse effect of exogenous ethylene on fruits during phase A is thought to be due to inhibition of cell division. The gradual transition occurring in the response of fruits during phase B was interpreted in terms of carbohydrate level in the fruits.

The onset of period III and a respiratory climacteric rise was preceded by or concomitant with a sudden burst of endogenous ethylene synthesis. This, together with the fact that exogenous ethylene applied at the proper stage of fruit growth triggers both ripening and the climacteric rise, leads to the conclusion that ethylene is the causal agent. In other words, the data support the concept that ethylene is a growth hormone that initiates a chain of metabolic and physiological events leading to fig fruit ripening.

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