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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2017, Volume : 5, Issue : 3
First page : (407) Last page : (414)
Article doi: http://dx.doi.org/10.18782/2320-7051.5070

Studies on Physical and Mechanical Properties of Rice Stem for Lodging Tolerance at Reproductive Phase in Rice (Oryza sativa L.)

Anand Rao1*, N., Sreekanth2, B., Sheshu Madhav3 M. and Narendar Reddy4, S. 
1,2,4Department of Crop Physiology, Professor Jayashankar Telangana State Agricultural University
(PJTSAU), Rajendranagar, Hyderabad
3Department of Biotechnology, Indian Institute of Rice research (IIRR), Rajendranagar, Hyderabad
*Corresponding Author E-mail: anandraoagri@gmail.com
Received: 13.06.2017  |  Revised: 22.06.2017   |  Accepted: 23.06.2017  


An experiment was conducted to find out  “Physical-mechanical basis of lodging nature of rice in rice (Oryza sativa L.)” by studying  relevant parameters in three different groups of rice germplasm viz., lodging susceptible varieties (Swarna, BPT-5204, Tellahamsa and RNR-15048); lodging tolerant varieties (MTU-1112, MTU-1121, MTU-1166 and MTU-1001) and stable strong culm mutant lines (SP-351, SP-353, SP-360 and SP-70).The current study showed that lodging tolerant varieties in general have lower plant height and stem lengths along with lower length of basal internode compared to lodging susceptible varieties. Further lodging tolerant varieties have higher outer diameter of basal internode (3rd internode), higher linear density and higher physical strength of culms compared to lodging susceptible varieties. But, the present study also showed that the mutant lines though showed greater plant heights and stem lengths, they were lodging tolerant (higher physical strength values), probably due to the mutagenic reasons. However, numbers of nodes appeared to be having no significant role in lodging nature of rice, which was an evident from the correlation studies between physical parameters and physical strength of culms. It can be concluded that lodging nature of the rice can be measured by taking any or all of the above said parameters except number of nodes. Out of all parameters linear density of the culm, outer diameter of the basal internode appear to be best indices of physical strength of rice culms in other words lodging nature of rice.

Key words:  Plant height, stem length, internodal length, culm diameter, linear density and physical strength.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Rao, A. N., Sreekanth, B., Madhav, S.M. and Reddy, N.S., Studies on Physical and Mechanical Properties of Rice Stem for Lodging Tolerance at Reproductive Phase in Rice (Oryza sativa L.), Int. J. Pure App. Biosci.5(3): 407-414 (2017). doi: http://dx.doi.org/10.18782/2320-7051.5070