Method of pollination and heritability for seedling vigor in switchgrass
respectively. The calculated heritability estimate was H2 = 0.6. Since the C0 and C1 nurseries were not grown on the same soil type, the lack of a positive response for seedling weight may be due to the different soil types. However, it may require another cycle of selection to determine if seedling mass can be positively impacted via half-sib selection. The mode of pollination of the species was determined by 1) observing pollen germination and tube growth in the pistils using fluorescent microscopy and 2) determining seed set with selfed plants. When self-pollinated, the pollen tubes never grew into the ovaries but when cross-pollinated the tubes readily grew to the micropyle. Also, when switchgrass plants were self-pollinated, viable seed were not produced. These findings indicate that switchgrass is highly self-sterile because a self-incompatibility mechanism prevents the pollen tubes from growing into the ovary of the same genotype.
Advisor:Ocumpaugh, William R.; Rooney, William L.; Burson, Byron L.; Hatch, Stephan L.; Tischler, Charles R.
School:Texas A&M University
School Location:USA - Texas
Source Type:Master's Thesis
Keywords:heritability pollen tube seedling vigor switchgrass
Date of Publication:05/01/2005