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Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
Spraying sugarcane crops with GIBBERELLINS elongates internodes, increasing stem length and boosting yield by up to 20 tonnes per acre!
Sugarcane stores carbohydrates as sucrose in its stems. Increasing the physical length and mass of the stem directly translates into higher commercial sugar yields.
Gibberellins stimulate cell division and dramatic internodal cell elongation. NCERT explicitly states: "Sugarcane stores carbohydrate as sugar in their stems. Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre."
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Cytokinins promote cell division and delay leaf senescence; they are not used commercially to elongate sugarcane stems.
Abscisic acid (ABA) is a growth inhibitor that promotes dormancy and stomatal closure.
Auxins promote apical dominance and rooting, but gibberellins are the specific PGR for sugarcane stem elongation.
Gibberellin application dramatically increases internode length in sugarcane, augmenting yield.
Assuming Auxin is used because it mediates shoot tip elongation.
"Sugarcane stores carbohydrate as sugar in their stems. Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre."
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