Abstract
Overcoming dormancy in stored and recently harvested Passiflora cincinnata Mast. seeds
Highlights
The species Passiflora cincinnata Mast., popularly known as ‘maracujá-do-mato’ and ‘maracujá-mochila’, is found in various states of Brazil, native to the semi-arid region, considered as tolerant to drought (ZUCARELI et al, 2009a) and resistant to the diseases caused by the fungus Fusarium oxysporum f. sp. passiflorae (SILVA et al, 2013), bacterial blight (Xanthomonas axonopodis pv. passiflorae) (OLIVEIRA et al, 2013), and fruit woodiness caused by cowpea apohid-borne mosaic virus - CABMV (OLIVEIRA et al, 2013)
GA4+7 + N-(phenyl methyl)-aminopurine is recommended to overcome dormancy of Passiflora cincinnata in recently harvested seeds (2016) and increase the emergence of seedlings from seeds stored for six years in cold chamber (2010)
The GA4+7 + N-(phenyl methyl)aminopurine concentration of 0.03% can be used in the dormancy breaking of recently harvested seeds and potentiates the vigor of seeds stored for six years
Summary
The vast diversity of Passifloraceae species in Brazil has great potential for utilization in pesticide production, pharmaceutical industry, cosmetics and in genetic improvement (OLIVEIRA JÚNIOR et al, 2010).The conservation and propagation of wild species are of great interest for the genetic improvement programs, because interspecific crosses allow to incorporate genes of resistance to the diseases in commercial species (SANTOS et al, 2015; FREITAS et al, 2016) and ornamental species (SOARES et al, 2015; OCAMPO et al, 2016).The species Passiflora cincinnata Mast., popularly known as ‘maracujá-do-mato’ and ‘maracujá-mochila’, is found in various states of Brazil, native to the semi-arid region, considered as tolerant to drought (ZUCARELI et al, 2009a) and resistant to the diseases caused by the fungus Fusarium oxysporum f. sp. passiflorae (SILVA et al, 2013), bacterial blight (Xanthomonas axonopodis pv. passiflorae) (OLIVEIRA et al, 2013), and fruit woodiness caused by cowpea apohid-borne mosaic virus - CABMV (OLIVEIRA et al, 2013).The limiting factors for the utilization of this species, either commercially or in genetic improvement programs, include the low and nonuniform germination of its seeds. The vast diversity of Passifloraceae species in Brazil has great potential for utilization in pesticide production, pharmaceutical industry, cosmetics and in genetic improvement (OLIVEIRA JÚNIOR et al, 2010). The species Passiflora cincinnata Mast., popularly known as ‘maracujá-do-mato’ and ‘maracujá-mochila’, is found in various states of Brazil, native to the semi-arid region, considered as tolerant to drought (ZUCARELI et al, 2009a) and resistant to the diseases caused by the fungus Fusarium oxysporum f. The limiting factors for the utilization of this species, either commercially or in genetic improvement programs, include the low and nonuniform germination of its seeds. The dormancy of Passifloraceae species was assumed to be caused by mechanisms of control of the entry of water in the seed, due to the hardness of the tegument (MORLEY-BUNKER, 1980). The dormancy of Passiflora cincinnata seeds may not be related to this mechanism, because Zucareli (2009a) observed that this species has permeability to water, concluding that the dormancy must be related to other physiological factors of the seed
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