Changes in Soybean Raceme and Petiole Anatomy Induced by 6-Benzylaminopurine |
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Authors: | KUANG ANXIU; PETERSON CURT M; DUTE ROLAND R |
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Institution: | Department of Botany and Microbiology, Alabama Agricultural Experiment Station, Auburn University Alabama 36849-5407, USA |
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Abstract: | An enlargement of the peduncle and rachis of the terminal racemeand the petiole of the uppermost mainstem leaf was observedin soybean plants Glycine max (L.) Merr.] treated with thecytokinin, 6-benzylaminopurine (BAP). Histological studies wereperformed to determine the timing and extent of anatomical changesaccompanying BAP treatment. Swelling of treated Tracy-Mpeduncles, rachises, and petioles was observed within 46d after treatment initiation. A significant increase in totalcross-sectional tissue area was observed at lower and intermediateinternodes of treated rachises after 11 d. Rachis enlargementwas due to increases in both cell size and cell number, particularlyof the vascular tissue. In treated petioles of IX93-100, procambialcells of vascular bundles were the first to respond to the BAPtreatment. These cells differentiated into a vascular cambiumwhich formed secondary xylem and phloem. Soybean, Glycine max (L.) Merr., anatomy, rachis, BAP. |
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