B082-0016
Drought resistance of five broadleaf and six conifer leaf plantation species based on morphological, physiological, and biochemical traits

Monday, 14 December 2020
Poster
Narayan Bhusal1, Minsu Lee2, Ah Reum Han3, Areum Han3 and Hyun Seok Kim4,5, (1)Seoul National University, Seoul, Korea, Republic of (South), (2)Seoul National University, Forest Science, Seoul, South Korea, (3)National Institute of Ecology, Division of Basic Research, Seocheon-gun, South Korea, (4)Seoul National University, Department of Forest Sciences, Seoul, South Korea, (5)Seoul National University, Research Institute for Agriculture and Life Sciences, Seoul, South Korea
Abstract:
In the era of climate change the frequency and severity of drought are expected to increase, therefore the plantation forests should to be testing their drought tolerance before transplanting into the field. In this study, we quantify the drought tolerance of the species based on their strongest performance of root collar diameter and plant height, and for better explanation we correlated of these parameters with other morphological, physiological, and biochemical traits. We selected eleven plantation species comprises of six conifer and five broadleaf species. Three different irrigation regimes: control (CT; 100% precipitation (P)), light drought (LD; 40% reduction of P), and heavy drought (HD; 80% reduction of P) were applied for this study.

The plant height and root collar diameter showed the strong relationship each other (P = 0.0002) in this study. With respect to the plant height, Japanese larch and Hinoki cypress showed drought sensitive; Korean pine, Korea red pine, and Black pine showed drought resistance; and East Asian ash, Sawtooth oak, and Sargent’s cherry showed medium drought resistance. On the other hand, with respect to the root collar diameter, the East Asian ash, Korean pine, Korea red pine, and Black pine showed drought resistance; Japanese larch, Sawtooth oak, and Sargent cherry showed medium drought resistance and East Asian white birch, Mono maple, and Hinoki showed the drought sensitive. Drought reduced the leaf size and increased the leaf mass per area (LMA, g cm-2) but leaf sizes showed strong correlation with root collar diameter (P = 0.012) but not the plant height (P = 0.241) and LMA showed the strong correlation with the plant height (P = 0.003) but not with the root collar diameter (P = 0.054). Moreover, drought reduced the physiological (photosynthetic response), hydraulic (Ψleaf, carbon isotope discrimination (δ13C)) and increased the abscisic acid (ABA) hormonal and antioxidant level. In our study, resistance of diameter was mainly explained and showed the greater correlation with photosynthesis (P = 0.0001), δ13C (P = 0.00002), abscisic acid (P = 0.0026), non-structural carbohydrate (P = 0.0429) but plant height greater explanation and showed the significant correlation with LMA (P = 0.0013), ΨPD (P = 0.046), ΨMD (P = 0.002), amino acid (P = 0.0314), and flavonoids (P = 0.002).

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