TY - JOUR
T1 - Morphological and physiological plasticity of Catalpa bungei roots under partial root-zone drought as affected by nitrogen forms
AU - Sun, Tiantian
AU - Ren, Ruohan
AU - Xing, Mingming
AU - Duan, Qiuxiao
AU - Zhao, Lang
AU - Yan, Wenwen
AU - Fang, Yang
AU - Zhang, Senyan
AU - Dong, Hao
AU - Wang, Mengran
AU - Heng, Qimeng
AU - Chen, Wenyi
AU - Xu, Ting
AU - Kou, Lili
AU - Li, Kunpeng
AU - Wang, Junhui
AU - Ma, Wenjun
AU - Zhang, Wangxiang
AU - Chen, Yinglong
AU - Lu, Yizeng
AU - Zhang, Yi
PY - 2024/5
Y1 - 2024/5
N2 - A greenhouse experiment was conducted to evaluate root plasticity and drought responses of Catalpa bungei under partial root-zone drought as affected by nitrogen (N) forms. A two-factor experimental design was used in which two nitrogen forms (ammonium nitrogen (AN) and nitrate nitrogen (NN)) were combined with four water treatments (well-watered condition (WW), vertical partial root-zone drought (V-PRD), horizontal partial root-zone drought (H-PRD), full root-zone drought (FRD)). Root parameters were interactively affected by water conditions and N forms. Root development was sharply inhibited by FRD, and nitrate (NN) was more beneficial than ammonium (AN) for lateral root elongation under FRD. Root responded to PRDs with changing of their morphological plasticity, depending on the supplied N forms. Moreover, root system exhibited contrasting strategy for water foraging under V-PRD and H-PRD. Under V-PRD, root forage for water by hydrotropism, which was indicated by active root proliferation in moist soil zone. This strategy contributed to the efficient carbohydrate production and dominant xylem development under V-PRD. In contrast, root forage for water under H-PRD by significant root proliferation in the drought soil zone. The absence of horizontal hydrotropism under H-PRD condition and the presence of vertical hydrotropism under V-PRD was related to the gravitropism action. Physiological plasticity under PRDs might be preliminary disclosed by the specific activation of antioxidant defense in the drought root zone. Specifically, APX, CAT and SOD were induced in the drought root zone (top zone) of V-PRD, and APX was induced in the drought root zone (right zone) of H-PRD. Root physiological plasticity under PRDs was related to N forms and it displayed contrasting patterns in NN and AN treatment.
AB - A greenhouse experiment was conducted to evaluate root plasticity and drought responses of Catalpa bungei under partial root-zone drought as affected by nitrogen (N) forms. A two-factor experimental design was used in which two nitrogen forms (ammonium nitrogen (AN) and nitrate nitrogen (NN)) were combined with four water treatments (well-watered condition (WW), vertical partial root-zone drought (V-PRD), horizontal partial root-zone drought (H-PRD), full root-zone drought (FRD)). Root parameters were interactively affected by water conditions and N forms. Root development was sharply inhibited by FRD, and nitrate (NN) was more beneficial than ammonium (AN) for lateral root elongation under FRD. Root responded to PRDs with changing of their morphological plasticity, depending on the supplied N forms. Moreover, root system exhibited contrasting strategy for water foraging under V-PRD and H-PRD. Under V-PRD, root forage for water by hydrotropism, which was indicated by active root proliferation in moist soil zone. This strategy contributed to the efficient carbohydrate production and dominant xylem development under V-PRD. In contrast, root forage for water under H-PRD by significant root proliferation in the drought soil zone. The absence of horizontal hydrotropism under H-PRD condition and the presence of vertical hydrotropism under V-PRD was related to the gravitropism action. Physiological plasticity under PRDs might be preliminary disclosed by the specific activation of antioxidant defense in the drought root zone. Specifically, APX, CAT and SOD were induced in the drought root zone (top zone) of V-PRD, and APX was induced in the drought root zone (right zone) of H-PRD. Root physiological plasticity under PRDs was related to N forms and it displayed contrasting patterns in NN and AN treatment.
KW - Catalpa bungei
KW - Drought tolerance
KW - Morphological plasticity
KW - Partial root-zone drought
KW - Physiological plasticity
UR - http://www.scopus.com/inward/record.url?scp=85161961213&partnerID=8YFLogxK
U2 - 10.1007/s11056-023-09983-9
DO - 10.1007/s11056-023-09983-9
M3 - Article
AN - SCOPUS:85161961213
SN - 0169-4286
VL - 55
SP - 383
EP - 402
JO - New Forests
JF - New Forests
IS - 3
ER -