Identification of genotypes for high water use efficiency and root traits in castor (Ricinus communis L.): IDENTIFICATION OF GENOTYPES FOR HIGH WATER USE EFFICIENCY AND ROOT TRAITS IN CASTOR

RAMESH THATIKUNTA; A SIVA SANKAR; L SAGARIKA; GOUTHAMI PALLE; J SREELAKSHMI; V GOURI SHANKAR; CH V DURGA RANI; B LAVANYA

doi:10.56739/jor.v33i1.139071

Authors

RAMESH THATIKUNTA Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana Stat
A SIVA SANKAR Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
L SAGARIKA Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
GOUTHAMI PALLE Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
J SREELAKSHMI Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
V GOURI SHANKAR Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
CH V DURGA RANI Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State
B LAVANYA Professor Jayashankar Telangana State Agriculture University, Rajendranagar-500 030, Hyderabad, Telangana State

https://doi.org/10.56739/jor.v33i1.139071

Keywords:

Castor, Root system architectural traits, Water use efficiency

Abstract

Castor (Ricinus communis L.) is an important non-edible oilseed crop of the world. Under rainfed situations the crop yields are low. Crop improvement programmes aim at improvement in seed yield, oil content and tolerance to biotic and abiotic stresses. Traits that contribute to water use efficiency (WUE) and improved productivity have not been adequately characterized in castor. In the present study, thirty five genotypes of castor were grown in a temporarily constructed elevated root study structure to characterize for superior shoot and root systemarchitectural (RSA) traits. Genotypes showed variation in characters that contributed to superior WUE and seed yield. Extrinsic WUE recorded with photosynthetic system ranged between 2.63 to 16.76 µmol CO2/mmol H2O. Intrinsic WUE values ranged between 36.1 to 53.3 µmol CO2 /mmol H2O. Photosynthesis and stomatal conductance values recorded ranged from13.1 to 21.6 µmol CO2 /m2 /s and 0.521to 0.647 mmol H2O/m2 /s. Greening index (SCMR) values ranged between 37 to 54. High Greening index was recorded in RG-48, Kranthi, PCS-230, SKI-215 and Haritha. SLA values ranged between 2.29 to 5.23 dm2 /g. Low SLA typesinclude RG-48, Kranthi, PCS-230, SKI-215 and Haritha. Carbon isotope discrimination (CID) value ranged between 17.49 to 19.52 per mill. Low discrimination to ª 13C included genotypes PCS-330, Kranthi, PCS-230 and PCS-265. Tap root length ranged from 67 to 234 cm. Long tap root was recorded in PCS 324, Haritha, Kranthi, PCS-171, PCS 328, PPL 109, RG-47, RG-48 and SKI-215. Total root volume ranged from 34 to 276 cm3. TDM ranged from 93.4 to 338.7 g. Seed yield ranged from 52 to 163 g/plant. Kranthi, RG-48, Haritha, PCS 171, PCS-230 and SKI-215 showed four to seven superior shoot root and seed yield characters have been proposed as superior WUE genotypes.

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Identification of genotypes for high water use efficiency and root traits in castor (Ricinus communis L.)