Plant and Soil

, Volume 155, Issue 1, pp 313–315 | Cite as

Effects of boron on pollen viability in wheat

  • C. Cheng
  • B. Rerkasem

Abstract

Grain set failure in wheat, caused by boron (B) deficiency, is associated with poorly developed pollen and anthers. This paper presents results of a study of the effect of B on pollen viability when it was supplied "internally" through the roots and externally in an agar medium for in vitro germination.

There was no major effect of B supply to wheat plants on the number of pollen anther-1 or the percentage of pollen with positive reaction to iodine. Pollen germination in the medium was, however, responsive to both internal and external B supply. When B was not added to the medium, germination was poor, regardless of the level of B supplied to the plant, in both a B deficiency sensitive (SW41) and a B deficiency tolerant (Sonora 64) genotypes. The percentage of germinated pollen and length of the pollen tube increased with increasing medium B. With 20–100 mg H3BO3 L-1 in the medium, the percentage of germinated pollen and length of the pollen tube responded positively to increasing B supply to the plant.

No difference was found between sensitive and tolerant genotypes in the effect of B on their pollen viability. On the other hand, without added B in the nutrient solution applied to the plant, grain set was depressed in the B deficiency sensitive SW41 and not in the B deficiency tolerant Sonora 64. A difference in B supply to the germinating pollen in the stigma and style is one possible explanation for this variation in the response to B among wheat genotypes.

Key words

anther boron deficiency fertilization grain set failure in vitro pollen germination pollen pollen tube wheat 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • C. Cheng
    • 1
  • B. Rerkasem
    • 1
  1. 1.Agricultural Systems Programme, Faculty of AgricultureChiang Mai UniversityThailand

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