[P3] Abiotic Stress for Crop Production

[P3-43] Genotypic Variation in Root Morpho-Anatomical Traits of Rice Cultivars with High and Low Adaptability under Multi-Stress Environment

^○Maria Corazon Julaton Cabral^1,2, Via Ann Candelaria Marcelo³, Roel Rodriguez Suralta³, Jonathan Manito Niones³, Antoinette Soriano Cruz³, Hiroshi Ehara^1,2, Yoshiaki Inukai^1,2, Akira Yamauchi¹, Mana Kano-Nakata^1,2 (1.Graduate School of Bioagricultural Sciences, Nagoya University, Japan, 2.International Center for Research and Education in Agriculture, Nagoya University, Japan, 3.Philippine Rice Research Institute, Philippines)

Drought and salinity are the most common coexistent abiotic stress factors impacting rice yield and productivity. Roots has an important role for the plant's adaptation to abiotic stresses. Plant breeding programs must include developing new cultivars with multiple stress tolerance and improved root traits. Hydroponic experiments were conducted in 20 OryzaSNP cultivars in control (non-stress), drought, saline, combined saline + drought stress and vice versa to determine the changes in root morpho-anatomical characteristics of cultivars with high and low adaptability and stability to abiotic stresses. Shoot biomass was significantly decreased in all cultivars followed by saline, saline + drought, drought and drought + saline. The root morpho-anatomical features were significantly influenced by genotype, treatments and their interactions. The root size in terms of anatomical traits were increased in all treatments compared to the non-stress condition. The variation in root diameter was due to the change in size and width of cortex and stele diameter. The correlation between agronomic and root morphological traits indicate strong and positive correlation however, mostly no correlation with root anatomical traits. AMMI (Additive Main Effects and Multiplicative Interaction) and BLUP (Best Linear Unbiased Prediction) model identified Dom-sufid and FR13A as cultivars with high stability, adaptability and productivity under multi-stress environments. An in-depth analysis encompassing histochemical analysis is on-going.