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Seed Germination Improvement Studies in Red Sanders (Pterocarpus Santalinus L.F) from Karnataka K..P

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Seed Germination Improvement Studies in Red Sanders (Pterocarpus Santalinus L.F) from Karnataka K..P International Research Journal of Multidisciplinary Science & Technology Volume: 02 Issue: 01 | January -2017 www.irjmrs.com ISSN: 2455-930X SEED GERMINATION IMPROVEMENT STUDIES IN RED SANDERS (PTEROCARPUS SANTALINUS L.F) FROM KARNATAKA K..P. Vijayalakshmi1 and P.R.Renganayaki2 1Assistant Professor, College of Forestry sirsi , University of Agricultural Sciences Dharwad 2Professor, Forest College and Research Institute Mettupalayam , Tamil Nadu Agricultural University, Tamil Nadu ---------------------------------------------------------------------***--------------------------------------------------------------------- ABSTRACT pharmaceutical, industrial and timber value and thus economically placed in the same range as tusk and amber. Pterocarpus santalinus L.f. is a highly valued timber species, because of its “heavy, dark claret-red Conventional vegetative propagation techniques such as heartwood,” especially that possessing a ‘wavy’ grain. Red grafting and air-layering have limitations in large-scale Sanders is an endemic and endangered species largely multiplication of this species and rooting of cutting was confined to the southern portion of the Eastern Ghats, Andhra Pradesh, India and propagated through seeds; also found to be poor (Kesava Reddy et al., 1990). Tissue problem in seed germination limits seedling production. culture has proved to be a promising technique for Current study was carried out to find out best conservation and large scale multiplication of several germination enhancement treatment. Mature pods woody species. However the members of Fabaceae have collected from three different sources were subjected to 6 treatments in 4 replications and experimental was been difficult to culture in vitro owing to their recalcitrant conducted in completely randomized design. The results nature, roots were robust and vigorous in air layers showed that Alternate Wetting and D rying of pods compared to stem cuttings, but the rate of manipulation is (AWD) for 48h resulted more synchronized germination of 73 percent followed by water soaking for 48h ( 52%) comparatively low and not enough to transplant in the as against 33% in control. nursery and main field (Rao and Raju, 2002). Based on the above reasons, the multiplication of the species Keywords: Pterocarpus santalinus, Alternate Wetting and Drying- improved seed germination largely depends on seed (Dayanand and Lohidas, 1988). Germination of Red sanders seed is often very difficult because of a hard seed coat coupled with poor viability Introduction (Dayanad et al., 1988; Naidu et al., 2001).Seed possessed Red sanders (Pterocarpus santalinus) is an with dormancy up to six months to one year, type of evergreen tree species grown under semi dry climates in dormancy has not yet been elucidated. Presence of well -drained lateritic soils,. endemic and endangered, dormancy cause prolonged germination. Considering the largely confined to the southern portion of the Eastern commercial importance of Pterocarpus santalinus and Ghats, Andhra Pradesh, India (Shilpa et al., 2012), some problems faced in seed propagation, to generate scientific pockets of Karnataka and Tamil Nadu (North Arcot hills); information on pod and seed factors responsible for poor cultivated in Maharashtra, Odisha and West Bengal and germination and treatments to enhance the germination introduced in Sri Lanka (Jain and Sastry, 1980). The by overcoming the obstacles, the present study was reddish and fragrant heartwood has range of medicinal, carried out. © 2016, IRJMRS [email protected] Page 1-5 I.M. 0.415 & 0.7 International Research Journal of Multidisciplinary Science & Technology Volume: 02 Issue: 01 | January -2017 www.irjmrs.com ISSN: 2455-930X Materials and Methods Pods were subjected to two cycles of 6h of Seed germination improvement were carried wetting and 6 h of drying and subjected to germination during 2015-16 at Forest College and Research Institute, test. Mettupalayam, Tamil Nadu, India. 7. Alternate wetting and drying for 48h (AWD) (T6) Seed sources Pods were subjected to two cycles of 12h of Seeds of Pterocarpus santalinus were collected wetting and 12h of drying and subjected to germination during June, 2015 from Bangalore, Karnataka Latitude test. 12° 58' N Longitude 77° 38' E Observations recorded Treatment details Four hundred number of seed / pods used for 1. Days to initial germination each treatment from each source @ 100/replication. The nursery bed was observed daily, for seedling 1. Control (T0) emergence. The day on which the first seedling emerged 2 . Mechanical Clipping of pod (T ) 1 was expressed as days to initial germination. Hard woody pod (Plate I.) was damaged at the 2. Days to final germination (Mauromicale and distal end using wire cutter/secateurs and subjected to Cavallaro, 1995) germination test. The number of days on which the last seedling emerged was recorded and expressed as days to final germination 3. Speed of germination ( Czabator, 1962) Speed of germination was calculated by the following formula, Speed of germination= n1/d1+n2/d2+n3/d3+---------- Where, n = number of germinated seeds; d= number of days Fig 1 Hard pod of Red sanders 4. Germination per cent (ISTA,2003) 3. Cow dung slurry (T2) The number of normal seedlings produced in Pods were mixed with cow dung slurry (1:2 ratio each replication(4 replication/25 pods ) was counted, and of water and cow dung) and kept for 24h and tested for average was expressed in per cent. germination in nursery. Number of normal seedlings Germination percentage = ×100 Total number of seed sown 4.Water soaking for 24h (T3) Pods were soaked in cold water for 24h duration 5. Seedling length and subjected to germination test. All normal seedlings of each treatment were 5 . Water soaking for 48h (T4) Pods were soaked in cold water for 48h duration measured for length from root tip to shoot tip and the and subjected to germination test. average was expressed in cm. 6.Alternate wetting and drying for 24h (AWD) (T5) © 2016, IRJMRS [email protected] Page 1-5 I.M. 0.415 & 0.7 International Research Journal of Multidisciplinary Science & Technology Volume: 02 Issue: 01 | January -2017 www.irjmrs.com ISSN: 2455-930X 6. Dry weight seed coat, or leaching of water soluble inhibitors. Seed All normal seedlings were dried under shade for germination test conducted in the present study revealed 24 h and then dried in hot air oven maintained at 85 ± 1°C that resulted in poor germination perc entage even after a for 48 h. It was cooled in a desiccator for 30 minutes and period of 57 days with a value of 33 per cent (Table 1). weighed. The values were expressed as ‘g seedlings-1’. Mechanical clipping of pod make a point of water 7. Vigour Index (Abdul-Baki and Anderson, 1973) entry inside seed, would allowed the seed to start the Vigour index (VI) was computed using the germination process, which resulted in little increased following formula and expressed as whole number. and early germination compared to control. seed VI = Germination percentage x dry weight possessed with physical dormancy due to hard seed coat (g/seedling) as in the case of Delonix regia (Aminu, 2012 and Shuaibu et al, 2015), or hard pod in the case of Pterocarpus marsupium (Venkataramaiah et al., 1980). Statistical analysis Table 1. Effect of treatment on seed germination Result data (in per cent) were transformed to characteristics arcsine values before statistical analysis in order to unify the Treatm Days to Days to Speed of Germina ent initiate final germinat tion % variance of the data (Ansari et al., 2012). The data were then germinat germinat ion analyzed by the ‘F’ test for significance at 0.05 level by using ion ion statistical software AGRESS. T0 13.00 57.00 00.21 33(35.06) T1 12.25 48.50 00.31 47(43.28) T 14.25 28.75 00.78 50(45.00) Result and Discussion 2 T 09.25 33.00 00.46 48(43.85) For seed technologists, seed germination is 3 emergence and development from the seed embryo of T4 08.75 28.50 00.53 52(46.14) those essential structures which are indicative of the T5 08.00 20.25 03.36 61(51.35) ability to produce a normal plant under favorable T6 08.00 16.00 04.79 73(58.69) conditions. The environmental conditions which are Mean 10.50 33.14 1.49 52(46.19) SE.D 0.57 1.46 0.04 1.02 necessary for germination are essentially water (during CD (P 1.16 2.96 0.08 2.07 imbibitions and subsequent stages of growth and ≤0.05) development) and oxygen and adequate temperatures for T0- Control , T1- Mechanical Clipping of pod T2- Cow metabolism and growth after imbibitions. dung slurry coating(48h), T3- Water soaking(24h), T4- Water soaking(48h), T Alternate Wetting and Drying No doubt different treatments had a significant 5- (24h), T6- Alternate Wetting and Drying (48h) and positive effect on improving and hastening seed *Figures in parentheses indicate arc-sine value germination the increment was low in mechanical The enhanced and more uniform germination with higher clipping, cow dung slurry 24h, water soaking 24h and seedling vigour of the cowdung slurry treatment may be alternate wetting and drying 24h, but pronounced effect the result of corrosion of pod coat by the week acids, in other two ie. alternate wetting and drying 48h and digestion of thin and strong veins by the microbes water soaking 48h treatments. Different set of treatments present in cow dung, both together might have resulted in might have their own effect either on weakening of hard © 2016, IRJMRS [email protected] Page 1-5 I.M. 0.415 & 0.7 International Research Journal of Multidisciplinary Science & Technology Volume: 02 Issue: 01 | January -2017 www.irjmrs.com ISSN: 2455-930X the opening of pores, supports or aids in water entry to inside the pod and accelerated the initial process of initiate pre germination metabolic events; entry of germination viz., breakdown of food material and growth stimulants present in cow dung and adequate synthesis of enzymes, as quoted by Walter et al.
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