Baudouin K.
Nyembo, Alexandre N. Mbaya, Calvin C. Ilunga, Jean-Louis N. Muambi, and Luc L. Tshilenge, from
the different institute of DR-Congo. wrote a Research
Article about, Ginkgo Beyond Home: How Egypt’s Climate Shapes Its Pollen and
Phenotypes. Entitled, Effects of 60Co gamma radiation doses on seed germination
of Jatropha curcas L.. This research paper published by the International Journal of Agronomy and Agricultural Research | IJAAR. an open access scholarly
research journal on Agronomy. under the affiliation of the International
Network For Natural Sciences| INNSpub. an open access multidisciplinary
research journal publisher.
Abstract
This study aimed to assess the effects of different gamma radiation doses from Cobalt -60 isotopic source on seed germination and early growth parameters of Jatropha curcas L. Healthy and dry seeds were subjected to three doses of gamma rays (100, 200 and 300 Gy). The experiment was conducted using randomized complete block design, with three replicates. The significantly maximum germination percentage (89.85 %), seedling survival (92.3 %), seedling collar diameter (0.892 cm), plant height (17.30 cm), number of leaves (7) were observed at 30 days after germination. The results revealed that seed germination percentages and seedling shoot length decreased with increasing dose of gamma-rays. Higher gamma-ray dose (300 Gy) in particular had a pronounced effect on these germination parameters than others, probably because high-dose inhibited cell division due to free radicals and DNA system damage. The LD50 for seeds germination rates was obtained at 254 Gy. These results implied that germination traits of Jatropha curcas seeds were sensitive to increase in gamma-ray.
Read more : Ginkgo Beyond Home: How Egypt’s Climate Shapes Its Pollen and Phenotypes | InformativeBD
Introduction
Jatropha curcas L.
belongs to the Euphorbiaceae family, a multipurpose, perennial, drought
resistant shrub or tree which is widely distributed in the wild or
semi-cultivated areas in Central and South America, Africa, India and South
East Asia (MartinezHerrera et al., 2006; Tatikonda et al., 2009). That is one
of the important oil seed crops and a potential source of vegetable oil as a
replacement for petroleum and in particular, the production of biodiesel (King et
al., 2009). It is gaining a lot of economic importance because of its several
potentials in industrial application and medicinal values. It is established
different parts of this biodiesel producing plant including leaves, oil, sap,
stem; roots and bark have numerous health benefits (Prasad et al., 2012;
Agbogidi et al., 2013).
In Democratic Republic
of Congo (RDCongo), the vernacular names of this plant are Nakakula, Mitanda,
Ludimba by the Luba; Mupuluka, Dasikamabete, Mpulungu, Mukadipemba, Ngubanguedi,
by the Kongo (Kambu, 1990).
Jatropha is a fast
growing plant and produce seeds after approximately two years depending on many
factors such as rainfall conditions and either the plant is propagated from
cuttings or from seeds (Heller, 1996). The first developmental stage of the
plant is germination, a critical stage in the life cycle of plants and this
growth stage is strongly influenced by environmental factors (De Villiers et
al., 1994). The studies on seed germination are needed to contribute to the
knowledge of Jatropha curcas cultivation.
Improved varieties of
J.curcas with desirable traits for specific growing conditions are not
available, which makes growing Jatropha a risky business. This plant can be
improved through application of mutation breeding to bring the change in the
desired traits (Divakara et al., 2010; Surwenshi et al.,2011; Nayak et al.,
2012). Mutation breeding which is efficient and much cheaper method than others
can play an important role in crop improvement either directly or by
supplementing the conventional breeding. Mutagenic agents, such as radiation
and certain chemicals, can be used to induce mutations and generate genetic
variation in seed germination, growth and yield traits of J.curcas
(Dhakshanamoorthy et al., 2010; Chiangmai et al., 2014). The doses of 10, 15,
20 and 25 Gy of gamma applied to cutting because of its higher water content
were able to increase genetic variability in J. curcas (Dwimahyani and Ishak,
2004). Sarhan et al. (2015) induced mutation in Jatropha curcas L. with gamma
rays 20 and 25 Kr dose in order to increase the tolerance and resistances
salinity of it. Pandey (2016) reported the effect of gamma rays on initial
development of Jatropha curcas especially on the cotyledonary leaves.
Irradiation dose of 225 Gy was good to be given in acute, intermittent, and
split-dose methods on the performance of Jatropha plants (Surahman et al.,
2018).
The main objective of
the present investigation was to study the effects of different gamma radiation
doses from Cobalt -60 isotopic source on seed germination and early growth of
Jatropha curcas L.
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