Morphological Variation of Vegetative Phase among Ma Wee (Oryza sativa L.) Accessions during Non-Inductive Growing Season for Flowering

Ma wee (Oryza sativa L.) had been a popular traditional rice in the past due to desirableagronomic traits for adverse environments. Ma wee accessions (Accns) are known to bephotoperiod sensitive for flowering initiation which flower during Maha (short day) season.Understanding morphological variation of Ma wee is useful in future analysis for geneticdiversity. Thirty nine Accns of Ma wee varieties used for the present study with the objectiveof determining variation of morphological responses when Accns remained in vegetativephase under non-inductive photoperiod for flower initiation at 210 days after sowing. Thirtynine Accns from plant genetic resources center, Sri Lanka were grown in Kamburupitiya withfour replicates in a completely randomised design at the end of Maha season in 2013/2014.Quantitative characters of plant height (PH), total tiller number (TTN), total leaf number(TLN), culm number (CN) and ligules length (LL) and qualitative characters of ligule color(LC), ligule shape (LS), internode color (IC), culm strength (CS) were recorded. None of the39 Accns flowered by 210 days and PH, TTN, TLN, CN, and LL varied from 87.5±1.61 cm,2±0.37, 8±0.84, 2±0.43, 1.8±0.46 cm to 199±1.36 cm, 22±2.09, 136±2.20, 24±2.03 and4.18±0.25 cm respectively. The lowest PH, TTN, TLN, and CN were recorded from Accn6253. Except for Accn 6253, rests 38 Accns were over 1 m in PH.Qualitative characters varied among clusters without any uniformity for a given cluster. CSvaried among Accns from weak, intermediate to strong. LC and IC varied from green towhite and green to yellow respectively. Acute to acuminate and two cleft LS were alsoobserved. Principal Component Analysis followed by Cluster Analysis was performed usingdata from quantitative characters. First two of PCs explained over 80% of total morphologicalvariations. The first PC represented the PH, TTN, TLN and CN whereas PC2 represented theLL. Eight clusters were obtained at rescaled distance five in the dendogram. Variation amongAccns within clusters for qualitative characters may be an indication of genetic diversity.Keywords: Ma wee, Morphological variation, Vegetative phase

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