AOBPreview originally published online on April 25, 2005
Annals of Botany 2005 96(1):59-67; doi:10.1093/aob/mci149
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Differences in in vitro Pollen Germination and Pollen Tube Growth of Cotton Cultivars in Response to High Temperature
1 Department of Plant and Soil Sciences, Box 9555, 117 Dorman Hall, Mississippi State University, Mississippi State, MS 39762, USA, 2 Agronomy Department, 304 Newell Hall, PO Box 110500, University of Florida, Gainesville, FL 32611, USA, 3 USDA-ARS, Alternate Crops and Systems Laboratory, Bldg 001, BARC-W, Baltimore Avenue, Beltsville, MD 20705-2350, USA and 4 USDA-ARS, Grazinglands Research Laboratory, El Reno, OK 73036, USA
* For correspondence. E-mail vgk3{at}ra.msstate.edu
Received: 24 November 2004 Returned for revision: 27 January 2005 Accepted: 28 February 2005 Published electronically: 25 April 2005
• Background and Aims High-temperature environments with >30 °C during flowering reduce boll retention and yield in cotton. Therefore, identification of cotton cultivars with high-temperature tolerance would be beneficial in both current and future climates.
• Methods Response to temperature (10–45 °C at 5 °C intervals) of pollen germination and pollen tube growth was quantified, and their relationship to cell membrane thermostability was studied in 12 cultivars. A principal component analysis was carried out to classify the genotypes for temperature tolerance.
• Key Results Pollen germination and pollen tube length of the cultivars ranged from 20 to 60 % and 411 to 903 µm, respectively. A modified bilinear model best described the response to temperature of pollen germination and pollen tube length. Cultivar variation existed for cardinal temperatures (Tmin, Topt and Tmax) of pollen germination percentage and pollen tube growth. Mean cardinal temperatures calculated from the bilinear model for the 12 cultivars were 15·0, 31·8 and 43·3 °C for pollen germination and 11·9, 28·6 and 42·9 °C for pollen tube length. No significant correlations were found between pollen parameters and leaf membrane thermostability. Cultivars were classified into four groups based on principal component analysis.
• Conclusions Based on principal component analysis, it is concluded that higher pollen germination percentages and longer pollen tubes under optimum conditions and with optimum temperatures above 32 °C for pollen germination would indicate tolerance to high temperature.
Key words: Cotton, Gossypium hirsutum, high temperature, cell membrane thermostability, principal component analysis, pollen germination, pollen tube, relative injury
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