Germination ecology of Medicago denticulata Willd. in relation to seed coat colour, persistence and herbicide exposure

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dc.contributor.advisorNavjyot Kaur
dc.contributor.authorSethi, Renu
dc.date.accessioned2019-05-27T10:24:40Z
dc.date.available2019-05-27T10:24:40Z
dc.date.issued2019
dc.description.abstractThe present study entitled, “Germination ecology of Medicago denticulata Willd. in relation to seed coat colour, persistence and herbicide exposure" was conducted at Punjab Agricultural University, Ludhiana and Dr. J.C. Bakhshi Regional Research Station, Abohar. Under natural conditions, M. denticulata produces heteromorphic seeds differing in seed coat colour - cream and brownish black. The study was aimed to compare the effect of seed coat colour on dormancy and germination behaviour of M. denticulata seeds and response of heteromorphic seeds to various environmental variables and herbicide exposure. Brownish black seeds were non-dormant with high moisture content. Cream seeds with low moisture content were dormant and germinated only when subjected to dormancy breaking treatments indicating seed coat imposed dormancy. Germination of both cream and brownish black seeds was independent of light. Cream seeds germinated in the wide temperature range of 15/5 to 30/20°C; while brownish black seeds germinated in narrow temperature range of 15/5 to 25/15°C. Brownish black seeds recorded no germination at 200 mM NaCl; whereas, some cream seeds (10%) were able to germinate at this NaCl concentration. The osmotic potential required for 50% inhibition of maximum germination of cream and brownish black seeds was -0.37 and -0.32 MPa, respectively. Brownish black seeds accelerated aged for 20 recorded no germination. Whereas, some cream seeds (∼13%) aged for 20 days were still able to germinate. Cream seeds placed on soil surface or buried at 2 and 10 cm depth germinated up to 12 months; but no germination was observed in brownish black seeds buried for 12 or more months. Therefore, cream seeds may have longer persistence than brownish black seeds. Herbicide sprays at eight and twelve-leaf stages of M. denticulata reduced seed production potential of this weed with concomitant decrease in germination as compared to herbicide sprays done at four-leaf stage of M. denticulata. This indicated possibility of herbicide carry-over effect from parent plants.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810104794
dc.keywordsDormancy, herbicide exposure, persistence, salinity, seeden_US
dc.language.isoenen_US
dc.pages136en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemGermination ecology of Medicago denticulata Willd. in relation to seed coat colour, persistence and herbicide exposureen_US
dc.subBotanyen_US
dc.subjectnullen_US
dc.themeGermination ecology of Medicago denticulata Willd. in relation to seed coat colour, persistence and herbicide exposureen_US
dc.these.typePh.Den_US
dc.titleGermination ecology of Medicago denticulata Willd. in relation to seed coat colour, persistence and herbicide exposureen_US
dc.typeThesisen_US
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