Photosynthetic Carbon Production and Use by Developing Cotton Leaves and Bolls

• DOI: 10.2135/cropsci1990.0011183x003000060021x
• Publication Date: 2010-07-29T16:33:34Z
• Authors: S. D. Wullschleger; D. M. Oosterhuis
• Keywords: Anthesis

Understanding the photosynthetic C contribution of leaves to vegetative and reproductive processes is important in defining yield productivity. However, morphological complexity cotton ( Gossypium hirsutum L.) canopy has proven a significant barrier establishing specific relationships. Therefore, 2‐yr study examined developmental sequences production utilization by bolls within crop canopy. Photosynthesis sympodial reached maximum just prior anthesis subtended flower thereafter declined throughout boll‐filling period. Carbon budgets for individual their at mainstem Nodes 8, 10, 12 indicated that was seldom synchronized with utilization. import requirements first three fruiting positions Node 10 were 50,37, 21%, respectively. Bolls 8 collectively required >60% sustain growth during season. Only capable supplying total needs bolls. deficiencies suggested substantial translocation photosynthate from adjacent outside node necessary. This confirmed through short‐term studies l4 C‐assimilate movement developing Breeding goals improved simulated evaluate avenues increased yields genetics. These simulations an advantage leaf longevity maintenance production.