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Effects of early-fruit removal on endogenous cytokinins and abscisic acid in relation to leaf senescence in cotton

“…Leaf senescence is a major determinant of yield in many crops (Thomas 1992). Senescence too early or too late would reduce the yield and quality of cotton (Wright 1999;Wingler et al 2006). Too early senescence for a whole plant in cotton is referred to as premature senescence, which has been occurring on an increasing scale since modern transgenic B. thuringiensis Berliner cotton cultivars were introduced for commercial production (Dong et al 2006).…”

“…However, it may occur too early or too late in the season due to environmental stresses or internal factors (Guinn 1985). Senescence too early (premature senescence) or too late (late maturity) would reduce the yield and quality of cotton (Wright 1999;Dong et al 2006). An understanding of leaf senescence and its causes may help to avoid too-early or too-late senescence through appropriate management.…”

“…An understanding of leaf senescence and its causes may help to avoid too-early or too-late senescence through appropriate management. The initiation and progression of leaf senescence in cotton can be affected by a number of environmental factors such as nutrient deficiency (Wright 1999) and drought (Radin 1981;Marani et al 1985), or internal factors like phytohormones (Yong et al 2000;Dong et al 2008a). Phytohormones, especially cytokinins, ABA, ethylene, jasmonic acid (JA), and methyl jasmonate (MeJA) are generally thought to be the main internal factors involved in the initiation and progression of leaf senescence (Creelman and Mullet 1997;Dong 1998;Hajouj et al 2000;He et al 2002;Yang et al 2004).…”

An econometric analysis of major Chinese food crops: An empirical study

“…The frequency of cotton premature senescence increased in many cotton-growing countries. This may come from the poor ability of cotton to take up other nutrients and potassium from the surface soil at the end of the season (Brouder & Cassman, 1990 ), or unbalanced sources and sinks (Wright, 1999).…”

Effect of 1-MCP on Boll Development and Subtending Leaves of Cotton (<i>Gossypium hirsutum</i> L.) Plants

“…In addition, ethylene works as an elicitor of leaf and flower senescence [13]. Premature senescence caused a lower photosynthetic rate and less carbon accumulation and thereby decreased yield in cotton [14]. Thus, it is desirable to protect yield by antagonizing the ethylene effect that would subsequently lead to the reduction of fruit shedding and to a delay of senescence.…”