Fruit senescence

Examples of antagonistic interaction include the effects of ABA and auxin on root tip surface charge (Tanada 1972) the effects of ABA and kinetin on coleoptile elongation (Khan and Downing 1968), the effects of GA and tannins on enzyme biosynthesis (Jacobson and Corcoran 1977) and the effects of ethylene and either GA3 or cytokinin on fruit senescence (Goldschmidt et al. 1977). 

Ribeiro, C., Vicente, A.A., Teixeira, J.A. and Miranda, C. (2007). Optimization of edible coating composition to retard strawberry fruit senescence. Postharvest Biology and Technology, 44(1), 63-70. 

Other forms of visible injury are related to various physiological alterations. Air pollution injury can cause early senescence or leaf drop. Stems and leaf structure may be elongated or misshapen. Ornamentals and fruit trees can also show visible injury to the blooms of the fruit, which can result in decreased yield. 

Abscisin II is a plant hormone which accelerates (in interaction with other factors) the abscission of young fruit of cotton. It can accelerate leaf senescence and abscission, inhibit flowering, and induce dormancy. It has no activity as an auxin or a gibberellin but counteracts the action of these hormones. Abscisin II was isolated from the acid fraction of an acetone extract by chromatographic procedures guided by an abscission bioassay. Its structure was determined from elemental analysis, mass spectrum, and infrared, ultraviolet, and nuclear magnetic resonance spectra. Comparisons of these with relevant spectra of isophorone and sorbic acid derivatives confirmed that abscisin II is 3-methyl-5-(1-hydroxy-4-oxo-2, 6, 6-trimethyl-2-cyclohexen-l-yl)-c s, trans-2, 4-pen-tadienoic acid. This carbon skeleton is shown to be unique among the known sesquiterpenes. 

Chlorophyll Degradation during Plant Senescence and Fruit... 

This chapter brings together information concerning structural features, spectral characteristics, distributions, and functions of major chlorophylls in photosynthetic organisms. Other topics discussed include biosynthesis and degradation in senescent plants and ripening fruits and potential biological properties of chlorophylls. 

CHtOROPHYtt Degradation during PtANT Senescence AND Fruit Ripening... 

Yahia EM, Contreras M and Gonzalez G. 2001b. Ascorbic acid content in relation to ascorbic acid oxidase activity and polyamine content in tomato and bell pepper fruits during development, maturation and senescence. Lebensm Wiss u-Technol 34 452-457. 

In spite of the often constitutive activity of AGO in the majority of plant tissues, an increase in its activity may regulate ethylene production especially associated with ripening and senescence of leaves, fruits, and flowers (see Sections 5.04.2.3 and 5.04.4.2.3, and Figure 3). 

Despite the potent influence of ethylene on the whole plant development, most often it has been recognized as a fruit-ripening and senescence-associated hormone. With respect to the gaseous nature of this hormone, the knowledge about ethylene sensitivity of fruit and flower is necessary to predict the effects of their mixed storage and transport and the usefulness of anti-ethylene treatments. Such commercial implications of ethylene have made it a topic of investigation for decades. 

---