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Pollen–pistil interaction, pistil histology and seed production in A×B grain sorghum crosses under chilling field temperatures

Published online by Cambridge University Press:  13 November 2009

M. E. CISNEROS-LÓPEZ
Affiliation:
INIFAP-Campo Experimental Río Bravo, Km 61 Carretera Reynosa-Matamoros, Apdo. Postal 172, 88900, Río Bravo Tamaulipas, México
L. E. MENDOZA-ONOFRE*
Affiliation:
Departments of Seed Production, Botany, Genetics, and Phytopathology, Colegio de Posgraduados, Campus Montecillo, Km. 36·5 Carretera México-Texcoco, 56230, Montecillo, México
H. A. ZAVALETA-MANCERA
Affiliation:
Departments of Seed Production, Botany, Genetics, and Phytopathology, Colegio de Posgraduados, Campus Montecillo, Km. 36·5 Carretera México-Texcoco, 56230, Montecillo, México
V. A. GONZÁLEZ-HERNÁNDEZ
Affiliation:
Departments of Seed Production, Botany, Genetics, and Phytopathology, Colegio de Posgraduados, Campus Montecillo, Km. 36·5 Carretera México-Texcoco, 56230, Montecillo, México
G. MORA-AGUILERA
Affiliation:
Departments of Seed Production, Botany, Genetics, and Phytopathology, Colegio de Posgraduados, Campus Montecillo, Km. 36·5 Carretera México-Texcoco, 56230, Montecillo, México
L. CÓRDOVA-TÉLLEZ
Affiliation:
Departments of Seed Production, Botany, Genetics, and Phytopathology, Colegio de Posgraduados, Campus Montecillo, Km. 36·5 Carretera México-Texcoco, 56230, Montecillo, México
M. HERNÁNDEZ-MARTÍNEZ
Affiliation:
INIFAP-Campo Experimental Bajío, Km. 65 Carretera Celaya-San Miguel Allende, Apdo. Postal 112, 38810, Celaya, Guanajuato, México
*
*To whom all correspondence should be addressed. E-mail: leopoldo@colpos.mx

Summary

Six pairs of isogenic lines of sorghum (Sorghum bicolor L. Moench) were sown in field plots in Montecillo, State of México (2240 m altitude), in 2005 and 2006. Crosses A (♀)×B (♂) were done in each pair. In A-lines, the length of pistil, stigma, style and ovary, as well as the ovary width, were measured. In B-lines, pollen diameter, viability (cytoplasm density) and production were evaluated. Pollen germination and pollen tube growth in the pistils of the A-lines, were quantified in vivo with aniline blue and epifluorescence 18 h after pollination (HAP), while fertilized pistils were counted at 96 HAP. Histological studies on both pollinated and non-pollinated pistils were performed in one male-sterile line. Seed yield, mean-seed weight, seeds per panicle and seed set (SS; seeds/flower/panicle) were determined at harvest. Pollen viability was the variable most related to pollen germination and pollen tube growth. Stigma receptivity was not associated with its morphology. Growth of the pollen tube in stigma, style and ovary was observed in the transmitting tissue 18 HAP, running parallel to the vascular tissue. Yield under chilling field temperatures (minimum average of 6 and 8°C) prevailing during flower development and pollination ranged from 7 to 12 g/panicle. The differences in seed production and SS among A×B crosses did not depend on the amount and viability of pollen.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 2009

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