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Article Dans Une Revue Rhizosphere Année : 2022

The plasticity of early root development in Sesamum indicum L. as influenced by genotype, water, and nutrient availability

Romain Gloaguen
Zachary Brym
  • Fonction : Auteur
Joshua Peeples
Weihuang Xu
Hyen-Chung Chun
Diane Rowland
  • Fonction : Auteur

Résumé

Precise knowledge on the impact of varying soil moisture and nutrient levels on the root system architecture of sesame is lacking. To that end, four non-dehiscent sesame cultivars (Sesaco32, 35, 38 and 40) were grown in rhizoboxes under four different soil water levels (60, 80, 100 and 120% of soil water holding capacity) over four replications. Two identical runs were performed without added nutrients and two other runs with added nutrients. The rhizoboxes were scanned at 2, 4, 7, 9, 11, 13, 14, 16, 18, and 21 days after planting (DAP) without nutrients, and only until 16 DAP with added nutrients. Images were analyzed for total root length (TRL) and average length per individual root branch (ARL). Results showed that without nutrients, TRL reached a plateau at 50.5 cm at 18 DAP on average across treatments, and S35 had the highest (66.4 cm) and S40 the lowest (31.4 cm) TRL at 21 DAP. TRL was only marginally affected by soil water level without nutrients. With added nutrients, TRL showed an exponential growth pattern reaching 103 cm at 16 DAP on average across treatments and was not affected by cultivar nor soil water level. These results showed that reduced soil water level has little to no impact on TRL, but that genotypic differences play an important role in determining belowground development without nutrients. A visual representation of root spatial distribution showed that although TRL differences existed between cultivar without nutrients, root spatial exploration appeared consistent. With added nutrients, the lack of significant difference in TRL between 100 and 120% soil water level (100.2 ± 19.2 and 114.1 ± 19.7 cm respectively) was not consistent with root spatial exploration, as these two soil water treatments displayed different RSA. These results show that sesame's early rooting behavior is controlled closely by genotypic factors in nutrient poor conditions, and that soil fertility can have a strong positive impact on early root growth. This is of interest to sesame breeders who could use nutrient poor environments to select for root architecture traits and improve the drought tolerance of the crop.

Domaines

Agronomie

Dates et versions

hal-04332152 , version 1 (08-12-2023)

Identifiants

Citer

Romain Gloaguen, Zachary Brym, Joshua Peeples, Weihuang Xu, Hyen-Chung Chun, et al.. The plasticity of early root development in Sesamum indicum L. as influenced by genotype, water, and nutrient availability. Rhizosphere, 2022, 21, pp.100457. ⟨10.1016/j.rhisph.2021.100457⟩. ⟨hal-04332152⟩
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