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JXB Advance Access published online on December 20, 2004
Journal of Experimental Botany, doi:10.1093/jxb/eri044
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Journal of Experimental Botany © Society for Experimental Biology 2004; all rights reserved
Received September 17, 2004
Accepted October 1, 2004

RESEARCH PAPER

Interactive effects of carbon dioxide, temperature, and ultraviolet-B radiation on soybean (Glycine max L.) flower and pollen morphology, pollen production, germination, and tube lengths

Sailaja Koti 1, K. Raja Reddy 1*, V. R. Reddy 2, V. G. Kakani 1, and Duli Zhao 1

1 Department of Plant and Soil Sciences, 117 Dorman Hall, Box 9555, Mississippi State University, Mississippi State, MS 39762, USA
2 USDA-ARS, Alternate Crops and Systems Laboratory, Bldg 001, Rm 342, BARC-W, 10300 Baltimore Ave., Beltsville, MD 20705, USA

* To whom correspondence should be addressed.
K. Raja Reddy, E-mail: krreddy{at}ra.msstate.edu


  Abstract

Plant reproduction is highly vulnerable to global climate change components such as carbon dioxide concentration ([CO2]), temperature (T), and ultraviolet-B (UV-B) radiation. The objectives of this study were to determine the effects of season-long exposure to treatments of [CO2] at 360 (control) and 720 µmol mol-1 (+CO2), temperature at 30/22 °C (control) and 38/30 °C (+T) and UV-B radiation 0 (control) and 10 kJ m-2 d-1 (+UV-B) on flower and pollen morphology, pollen production, germination, and tube lengths of six soybean genotypes (D 88-5320, D 90-9216, Stalwart III, PI 471938, DG 5630RR, and DP 4933RR) in sunlit, controlled environment chambers. The control treatment had 360 µmol mol-1 [CO2] at 30/22 °C and 0 kJ UV-B. Plants grown either at +UV-B or +T, alone or in combination, produced smaller flowers with shorter standard petal and staminal column lengths. Flowers so produced had less pollen with poor pollen germination and shorter tube lengths. Pollen produced by the flowers of these plants appeared shrivelled without apertures and with disturbed exine ornamentation even at +CO2 conditions. The damaging effects of +T and +UV-B were not ameliorated by +CO2 conditions. Based on the total stress response index (TSRI), pooled individual component responses over all the treatments, the genotypes were classified as tolerant (DG 5630RR, D 88-5320: TSRI >-790), intermediate (D 90-9216, PI 471938: TSRI <-790 to >-1026), and sensitive (Stalwart III, DP 4933RR: TSRI <-1026). The differences in sensitivity identified among genotypes imply the options for selecting genotypes with tolerance to environmental stresses projected to occur in the future climates.

Keywords: Carbon dioxide; pollen germination; pollen tube length; soybean; temperature; ultraviolet-B radiation.
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