Seed germination and emergence ecology of Monochoria vaginalis (Burm. f.) Kunth

G.R. Athira, Meera V. Menon, P. V. Sindhu, P. Prameela

Abstract


Monochoria vaginalis is a noxious herbaceous semi aquatic weed in the family Pontederiaceae, present in paddy fields throughout the rice growing areas of the world. A study was conducted to determine the effect of depth of burial, pH, salinity, flooding, light and temperature on germination of Monochoria vaginalis. Monochoria seeds germinated on soil surface, but not when placed below 2 cm depth. The germination was found to be higher in solutions of pH 6 and 7, but seeds did not germinate when immersed in buffered solutions of pH 4, 5, 8, and 9. Saline solutions with concentrations ranging from 25 to 250 mM NaCl inhibited the germination. Seeds kept in continuous dark condition failed to germinate irrespective of the temperature provided. Monochoria seeds germinated at a temperature of 38oC in continuous light, and in alternate light and dark condition. Seed germination in Monochoria was significantly influenced by flooding depth and duration. Greater germination was obtained when seeds were kept in saturated soil condition and low flooding depth (i.e., less than 5 cm) for more than 4 days.


Keywords


Depth of burial, Flooding, Light, pH, Salinity, Semi aquatic weed, Temperature

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References


Chen, P. H. and Kuo, W. H., 1995. Germination conditions for the non-dormant seeds of Monochoria vaginalis. Taiwania, 40(4):419-432.

Chisaka, H. and Kataoka T. 1977. Physiological seed dormancy of annual lowland weeds. Weed Res., 22: 94-96.

Kataoka, T. and S. Y. Kim 1978. Emergence depth of seeds of several weeds. Weed Res., 23: 13-19.

Koarai, A. and Shibayama, H. 2001. Effects of puddling time on seasonal changes in number and depth of emergence of annual weeds in paddy fields. J. Weed Sci. Tech., 46: 5-12.

Matsuo, M. and Shibayama, H. 2000. Role of hypocotyl hairs in adhering strength and establishment of juvenile seedlings of Monochoria vaginalis to different seed beds. J. Weed Sci. Tech., 45 (3): 190-199.

Moody, K. 1989. Weeds Reported in Rice in South and South East Asia. International Rice Research Institute, Manila, 442p. Available: pdf.usaid.gov/pdf_docs/ PNABD 500.pdf [17 Dec. 2017].

Nozoe, T., Uchino, A., Okawa, S., Yoshida, S., Kanda, Y., and Nakayama, Y. 2012. Suppressive effect of rice bran incorporation in paddy soil on germination of Monochoria vaginalis and its relationship with electric conductivity. Soil Sci. Plant Nutr., 58: 200-205.

Nozoe, T., Tazawa, J., Uchino, A. and Miura, S., 2018. Promotive effect of soil solution on germination of Monochoria vaginalis under paddy conditions. Soil Sci. Plant Nutr., 64(3):396-405.

Park, M. W., Kim, J. W., Lim, S. H., Lee, I. Y., and Kim, D. S. 2010. Prediction of seedling emergence and early growth of Monochoria vaginalis and Scirpus juncoides under elevated temperature. Kor. J. Weed Sci., 30(2)103-110.

Pons, T. L., 1982. Factors affecting weed seed germination and seedling growth in lowland rice in Indonesia. Weed Res., 22(3):155-161.

Putra, S. P. 2014. The effects of salinity and water depth on the growth, morphology, and anatomy of Eceng padi (Monochoria vaginalis (Burm.f.) Presl.). Doctoral dissertation, Universitas Gadjah Mada.


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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]