Roses (Rosa hybrida) are the most important ornamental cut-flowers and breeders main focus is to develop new desirable modern cultivars. Rose breeding programs center mainly on the introduction of new flower colors, thornless stems, higher production and good post-harvest performance. Rose propagation by seed is used in breeding new cultivars as well as in the production of rootstock plants. However, rose seed germination is quite problematic due to endogenous and exogenous dormancy, requiring prolonged and expensive treatments. Poor seed germination (less than 20%) is one of the major problems encountered in rose breeding programs. To avoid the risk of very low seed production during hybridization, breeders use high pollen quantities from a limited number of male parents chosen for their known and exogenous treatments can be used to enhance seed germination. Gamma-rays are used in plant biology to induce desirable traits, such as stress tolerance, and to enhance seed vigor. The careful evaluation of irradiation parameters (total dose, dose rate) and genotoxic effects represents a relevant premise for designing effective seed vigorisation protocols. The present work reports on the effects of gamma-rays treatments on seeds of elite Rosa hybrida cultivars provided by NIRP International, a leader Company in rose breeding and production.
Effects of gamma-irradiation on the germination efficiency of Rosa hybrida seeds.
CASER, Matteo;SCARIOT, VALENTINA;
2013-01-01
Abstract
Roses (Rosa hybrida) are the most important ornamental cut-flowers and breeders main focus is to develop new desirable modern cultivars. Rose breeding programs center mainly on the introduction of new flower colors, thornless stems, higher production and good post-harvest performance. Rose propagation by seed is used in breeding new cultivars as well as in the production of rootstock plants. However, rose seed germination is quite problematic due to endogenous and exogenous dormancy, requiring prolonged and expensive treatments. Poor seed germination (less than 20%) is one of the major problems encountered in rose breeding programs. To avoid the risk of very low seed production during hybridization, breeders use high pollen quantities from a limited number of male parents chosen for their known and exogenous treatments can be used to enhance seed germination. Gamma-rays are used in plant biology to induce desirable traits, such as stress tolerance, and to enhance seed vigor. The careful evaluation of irradiation parameters (total dose, dose rate) and genotoxic effects represents a relevant premise for designing effective seed vigorisation protocols. The present work reports on the effects of gamma-rays treatments on seeds of elite Rosa hybrida cultivars provided by NIRP International, a leader Company in rose breeding and production.
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