Induction of sporogenesis in Gracilaria Spp (Gigartinales, Rhodophyta) by environmental manipulation.

Saravanane, P (2001) Induction of sporogenesis in Gracilaria Spp (Gigartinales, Rhodophyta) by environmental manipulation. Masters thesis, Central Institute of Fisheries Education.

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    Abstract

    Gracilaria spp have been regarded as the most important agarophytes for cultivation due to their high regenerative capacity. Seaweed farming from spores of Gracilaria is considered as an alternative tool to protect the natural stock and to meet the demand of raw materials for the agar industries. Non-availability of female reproductive plants with mature carpospores during favourable period of cultivation is a general constraint of reproductive propagation. The present work includes study of developmental stages of carposporogenesis, induction of sporogenesis, spore output, early growth and survival of spores. Gracilaria edulis and G. foliifera were subjected to various environmental parameters such as photoperiod, light spectra, light intensity and temperature for induction of sporogenesis. G. foliifera showed initiation of sporogenesis under long day at 2000 lux light intensity and temperature of 25° C, while in G. edulis sporogenesis was initiated under red spectra (630-670nm). The chlorophyll a, phycoerythrin and allophycocyanin contents showed increase under 630-670nm. The histological observation clearly showed the developmental stages of cystocarp in G. edulis and G. foliifera. Maximum spore output was obsen/ed at 25° C and short day photoperiod for both the species (P>0.01) for first two days and declined subsequently. The spores of G. edu//sand G. foliifera have grown well up to 8 days in PES medium maintained under temperature range of 25-26° C (r=0.99).

    Item Type: Thesis (Masters)
    Uncontrolled Keywords: Induction; Sporogenesis; Gracilaria Spp (Gigartinales, Rhodophyta); Environmental manipulation
    Subjects: Dissertations
    Marine Environment > Marine Pollution
    Algae
    Divisions: CMFRI-Kochi > Mariculture
    Subject Area > CMFRI > CMFRI-Kochi > Mariculture
    CMFRI-Kochi > Mariculture
    Subject Area > CMFRI-Kochi > Mariculture
    Depositing User: Mr Rakesh
    Date Deposited: 17 Sep 2016 04:31
    Last Modified: 06 Oct 2016 10:15
    URI: http://eprints.cmfri.org.in/id/eprint/11130

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