Influence of storage structure on seed longevity in rice (Oryza sativa L.)

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dc.contributor.advisorRose Mary, Francies
dc.contributor.authorJyothish Babu, E
dc.contributor.authorKAU
dc.date.accessioned2021-09-10T09:31:01Z
dc.date.available2021-09-10T09:31:01Z
dc.date.issued2020
dc.descriptionPGen_US
dc.description.abstractAgeing of seeds is an inevitable natural deteriorative phenomenon, eventually resulting in loss of vigour and viability. Adopting appropriate storage, ensuring optimum storage environment have been advocated to slow down the pace of the deteriorative process during storage, maintain the seed quality and prolonging seed longevity. Considering the above, a study to elucidate the effect of different storage structure on seed longevity and quality of short duration rice varieties (Experiment 1) and medium rice varieties (Experiment 2) was conducted at College of Horticulture, Vellanikkara, Thrissur, during 2019 - 2020. The storage experiments were conducted following a completely randomized design with four varieties replicated thrice under five storage conditions (SC1 to SC5), each varying from the other with respect to the type of roofing and provision of ventilation. The short duration varieties used in Experiment 1 were Harsha, Matta Triveni, Manurathna and Kanchana, while, the medium durations varieties in Experiment 2 were, Aiswarya, Sreyas, Jyothi and Uma. The quality parameters of seeds stored in SC1 (Asbestos + ventilation), SC2 (Asbestos + without ventilation), SC3 (R.C.C. + ventilation), SC4 (R.C.C. + without ventilation) and SC5 (Asbestos + forced ventilation) were recorded at the start of storage and subsequently at monthly intervals for a period of nine months. The temperature and relative humidity in each storage condition were recorded at weekly intervals. Varieties, storage conditions, the period of storage and their interactions were found to exert significant influence on seed quality and longevity in both short duration and medium duration varieties. Irrespective of the varieties and the storage conditions, the seed quality parameters viz., germination (%), vigour indices (VI-I and VI-II) and field establishment (%), declined over the storage period, whereas an increase in seed moisture content (%), electrical conductivity of seed leachate (dSm-1) and seed microflora, was observed. Germination and longevity of varieties Matta Triveni and Harsha was higher than that of varieties Manurathna and Kanchana. Seed longevity was higher (8 months each) in varieties Harsha and Matta Triveni compared to varieties Manurathna and Kanchana (7 months each). The seed vigour indices (VI-I and VI-II), field establishment (%) of Matta Triveni were significantly high, while the estimates of seed moisture (%) and EC of seed leachate were significantly low in Kanchana. In case of medium duration varieties, although germination was higher in varieties Aiswarya and Shreyas compared to Jyothi and Uma, the longevity of seeds in all varieties was retained for eight months. Germination, vigour (VI-II) and field establishment (%) was significantly high in Aiswarya, while the seed moisture and EC of seed leachate was found to be significantly low in Sreyas. Variety Uma registered significant low seed quality parameters. In both short and medium duration varieties, the quality of seeds stored under ventilated conditions (SC1, SC3 and SC5) was found to be the significantly superior to those stored in non-ventilated structures (SC2 and SC4). Irrespective of the type of roofing (Asbestos or R.C.C), seed longevity in ventilated godowns were found to be retained above IMSCS, one month longer (8 MAS) than when stored under nonventilated environment (7 MAS). The interaction between varieties, storage condition and the period of storage, indicated that seed longevity in all medium duration varieties stored under ventilated storage and non-ventilated storages was eight and seven months respectively. Unlike in the medium duration group, the longevity of all the longevity of short duration varieties Matta Triveni and Harsha was higher by a period one month i.e., 8 MAS, when stored under ventilated environments conditions viz., R.C.C. + ventilation (SC3), Asbestos + ventilation (SC1) and Asbestos + forced ventilation (SC5) as against 7 MAS under non-ventilated storage [Asbestos + without ventilation (SC2), R.C.C. + without ventilation (SC4)] High temperature and relative humidity within the storage environment strongly influenced germination and seed longevity. The decline in germination was found to be more pronounced when the seed was exposed to high temperatures in the early period of storage i.e., between 1 and 13th week, while high RH during the 2nd half of the storage period (i.e., between 24th and 36th week), proved to be detrimental to seed longevity. Among the storage structures, the temperature and RH inside ventilated storage (SC3, SC1 and SC5) was relatively lower than that in non-ventilated structure (SC4 and SC4). Marginal variations in temperature and RH was evident between the ventilated stores, with the least estimate in Asbestos + forced ventilation (SC5). However, most quality parameters and longevity of seeds in these conditions were on par with each other. From the above results, it can be summarized that storing seeds in ventilated storage structures, was clearly advantageous over storing them under non-ventilated conditions. Only marginal variations in seed quality parameters was observed between the ventilated conditions. Neither did storing seed in godowns with provision for forced ventilation improve the longevity of stored seeds over those with provision for natural ventilation. Incurring additional expenditure on installation, maintenance and operation of forced ventilation system did not to confer any additional benefits. Considering all the above, it would be more advantageous to store seeds under ventilated conditions with provision for natural ventilation.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810175622
dc.language.isoEnglishen_US
dc.pages230p.en_US
dc.publisherDepartment Seed Science and Technology, College of Horticulture, Vellanikkaraen_US
dc.subSeed Science and Production Technologyen_US
dc.themeseed longevity in riceen_US
dc.these.typeM.Scen_US
dc.titleInfluence of storage structure on seed longevity in rice (Oryza sativa L.)en_US
dc.typeThesisen_US
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