Apricot (Prunus armeniaca L.) is a fruit species showing several problems related to its floral biology with inconstant and extremely low yield attributed to the lack of climatic adaptation when the unsatisfactory cropping cannot be traced to strictly genetic factors. This set of phenomena has been attributed to an unsatisfied chilling requirement and an incomplete bud dormancy overcoming leading to the appearance of flower bud anomalies. The aims of this study was to characterize a large number of native Italian apricot cultivars through the evaluation of their floral biology. In particular, the ‘Chilling Requirement’, the blooming aptitude and susceptibility to the floral anomalies were estimated. The forcing method was used to determine the Chilling Requirement of the 23 Italian germplasm genotypes and classified them into three types: low (< 1000 CU), medium (1000-1200) and high (>1200). The first two cultivar types have a shorter endodormancy phase, an earlier beginning of flowering with a good blooming entity. However, these cultivars showed high percentages of early anomalous buds. The third group is composed of cultivars that show a low flowering percentage and high levels of later bud drops. It has been observed many and diversified ‘floral anomalies’, such as necrosis and pistil abortion, during bud and flower development from endodormancy to bloom, not strictly related to the chilling requirement.Apricot (Prunus armeniaca L.) is a fruit species showing several problems related to its floral biology with inconstant and extremely low yield attributed to the lack of climatic adaptation when the unsatisfactory cropping cannot be traced to strictly genetic factors. This set of phenomena has been attributed to an unsatisfied chilling requirement and an incomplete bud dormancy overcoming leading to the appearance of flower bud anomalies. The aims of this study was to characterize a large number of native Italian apricot cultivars through the evaluation of their floral biology. In particular, the ‘Chilling Requirement’, the blooming aptitude and susceptibility to the floral anomalies were estimated. The forcing method was used to determine the Chilling Requirement of the 23 Italian germplasm genotypes and classified them into three types: low (< 1000 CU), medium (1000-1200) and high (>1200). The first two cultivar types have a shorter endodormancy phase, an earlier beginning of flowering with a good blooming entity. However, these cultivars showed high percentages of early anomalous buds. The third group is composed of cultivars that show a low flowering percentage and high levels of later bud drops. It has been observed many and diversified ‘floral anomalies’, such as necrosis and pistil abortion, during bud and flower development from endodormancy to bloom, not strictly related to the chilling requirement.

Apricot floral biology: the evolution of dormancy and the appearance of bud anomalies in several Italian genotypes

VITI, RAFFAELLA;
2006

Abstract

Apricot (Prunus armeniaca L.) is a fruit species showing several problems related to its floral biology with inconstant and extremely low yield attributed to the lack of climatic adaptation when the unsatisfactory cropping cannot be traced to strictly genetic factors. This set of phenomena has been attributed to an unsatisfied chilling requirement and an incomplete bud dormancy overcoming leading to the appearance of flower bud anomalies. The aims of this study was to characterize a large number of native Italian apricot cultivars through the evaluation of their floral biology. In particular, the ‘Chilling Requirement’, the blooming aptitude and susceptibility to the floral anomalies were estimated. The forcing method was used to determine the Chilling Requirement of the 23 Italian germplasm genotypes and classified them into three types: low (< 1000 CU), medium (1000-1200) and high (>1200). The first two cultivar types have a shorter endodormancy phase, an earlier beginning of flowering with a good blooming entity. However, these cultivars showed high percentages of early anomalous buds. The third group is composed of cultivars that show a low flowering percentage and high levels of later bud drops. It has been observed many and diversified ‘floral anomalies’, such as necrosis and pistil abortion, during bud and flower development from endodormancy to bloom, not strictly related to the chilling requirement.Apricot (Prunus armeniaca L.) is a fruit species showing several problems related to its floral biology with inconstant and extremely low yield attributed to the lack of climatic adaptation when the unsatisfactory cropping cannot be traced to strictly genetic factors. This set of phenomena has been attributed to an unsatisfied chilling requirement and an incomplete bud dormancy overcoming leading to the appearance of flower bud anomalies. The aims of this study was to characterize a large number of native Italian apricot cultivars through the evaluation of their floral biology. In particular, the ‘Chilling Requirement’, the blooming aptitude and susceptibility to the floral anomalies were estimated. The forcing method was used to determine the Chilling Requirement of the 23 Italian germplasm genotypes and classified them into three types: low (< 1000 CU), medium (1000-1200) and high (>1200). The first two cultivar types have a shorter endodormancy phase, an earlier beginning of flowering with a good blooming entity. However, these cultivars showed high percentages of early anomalous buds. The third group is composed of cultivars that show a low flowering percentage and high levels of later bud drops. It has been observed many and diversified ‘floral anomalies’, such as necrosis and pistil abortion, during bud and flower development from endodormancy to bloom, not strictly related to the chilling requirement.
Viti, Raffaella; Bartolini, S; Guerriero, R.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/108517
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