Pollen grain germination and pollen tube growth following in vivo and in vitro self and interspecific pollinations in annual Cicer species |
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Authors: | A Bassiri F Ahmad A E Slinkard |
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Institution: | (1) Department of Agronomy, College of Agriculture, Shiraz University, Shiraz, Iran;(2) Crop Development Centre, University of Saskatchewan, S7N OWO Saskatoon, Sask., Canada |
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Abstract: | Summary Germination of pollen grains and growth of pollen tubes were studied to determine the cause of barreness in crosses among annual Cicer species. In vivo and in vitro time-course studies and fluorescent microscopy revealed no pollination incompatibility among the selfs, crosses and reciprocals of C. arietinum L., C. reticulatum
Lad. and C. cuneatum
Rich. In general, Cicer pollen grains germinated and grew on styles of Cicer species. Pollen tube growth was characterized by irregularly spaced and intermittent callose deposits. Failure of seed formation in interspecific pollinations may be attributed to the slowness of pollen tube growth or collapse of fertilized ovules. In addition to these causes, shortness of stamens and sparsity of pollen grains were responsible for flower drop in natural selfs. Although the number of pollen tubes entering the micropyle in interspecific pollinations was low, it may be possible to grow the fertilized ovules on an artificial medium to obtain F1 plants. |
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Keywords: | Cicer arietinum chickpea Cicer reticulatum Cicer cuneatum pollen compatibility |
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