|Title||Inductie van mutaties bij rijst door röntgenbestraling|
|Source||University. Promotor(en): C. Coolhaas; J.C. Dorst. - Wageningen : Veenman - 68|
|Publication type||Dissertation, internally prepared|
|Keyword(s)||plantkunde - rijst - oryza sativa - genetische variatie - mutaties - plantenveredeling - straling - elektromagnetische straling - elektriciteit - magnetisme - radioactiviteit - botany - rice - genetic variation - mutations - plant breeding - radiation - electromagnetic radiation - electricity - magnetism - radioactivity|
|Abstract||The experiments described were intended to supply the Surinam rice-breeder with material for selection with mutations induced by X-rays and to find the most efficient way of procuring these mutations. The experiments used two of Surinam's commercial rice varieties, Nickerie and Holland.
The monogenic recessive chlorophyll mutations segregating in young X 2 seedlings at the 2-leaf to 4-leaf stage were used as test mutations to investigate the frequency of factor mutations. X-rays induced useful mutations. Some X 2 -mutants which seemed of little use to the breeder, segregated at F 3 to yield further useful mutations.
The author drew several conclusions on method. By harvesting only the X 1 head of the main stalk and the X 1 heads of several of the first-formed primary stalks, which mutate independently of each other, the breeder would probably get the largest possible yield of factor mutations. For this purpose the breeder should set his plants so closely that only these stalks will develop. From the X 1 heads only those with a fertility of 80-100% need be harvested. Useful mutations should be selected in X 2 and in offspring of all lines related to X 2 mutants.