Effect of Water Deficit on Growth and Photoassimilate Partitioning in Leersia hexandra and Luziola peruviana

Renan Souza Silva, Ananda Scherner, Cristiane Jovelina Da-Silva, Edinalvo Rabaioli Camargo, Roque Mauricio Palacios-Zuñiga, Fabio Schreiber, Luciano do Amarante, José Maria Barbat Parfitt and Luis Antonio de Avila ()
Additional contact information
Renan Souza Silva: Plant Physiology Graduate Program, Federal University of Pelotas (UFPel), Campus Universitário, S/N, Capão do Leão 96160-000, Brazil
Ananda Scherner: BioPhero, Lersø Parkallé 42, 4th Floor, 2100 Copenhagen, Denmark
Cristiane Jovelina Da-Silva: Plant Physiology Graduate Program, Federal University of Pelotas (UFPel), Campus Universitário, S/N, Capão do Leão 96160-000, Brazil
Edinalvo Rabaioli Camargo: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Capão do Leão 96160-000, Brazil
Roque Mauricio Palacios-Zuñiga: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Capão do Leão 96160-000, Brazil
Fabio Schreiber: Syngenta, Av. das Nações Unidas, 17007-Várzea de Baixo, São Paulo 04729, Brazil
Luciano do Amarante: Chemical Sciences, Pharmaceutical and Food Center (UFPel), Campus Universitário, S/N, Capão do Leão 96160-000, Brazil
José Maria Barbat Parfitt: Brazilian Agricultural Research Corporation (Embrapa), Campus Universitário, S/N, Capão do Leão 96010-971, Brazil
Luis Antonio de Avila: Department of Crop Protection, Federal University of Pelotas (UFPel), Campus Universitário, S/N, Capão do Leão 96160-000, Brazil

Agriculture, 2022, vol. 12, issue 8, 1-15

Abstract: Minimum tillage in rice production is increasing in southern Brazil, reaching 60% of the total planted area. Compared to conventional tillage, in this system there is an increase in the occurrence of perennial weeds, such as Luziola peruviana and Leersia hexandra , which are amphibious plants, as they can occur in both flooded environments and aerobic conditions. These weeds are controlled in burn-down before rice planting by glyphosate applications, the efficacy of which depends on the soil moisture. This study aimed to evaluate the effect of different soil moisture regimes in L. hexandra and L. peruviana growth and photoassimilate partitioning. Both species were assessed under soil moisture regimes of flooded, saturated, 7 kPa, 15 kPa, 40 kPa, and 100 kPa (experiment 1) and flooded, saturated, and 7 kPa (experiment 2). Plants were sampled immediately after drainage (3 months after transplant) and 1 and 2 weeks after drainage. The results showed that as soil moisture levels decreased, growth and development parameters were negatively affected in both species. Photoassimilate partitioning was affected by water regime and differences were observed between species. The total soluble sugars and starch content decreased in the leaves, and sucrose concentration increased in the roots following drainage. Soil drainage affects the growth and alters carbohydrate partitioning of these weeds, increasing the sugar storage in roots. The agronomic impact of these findings is that this behavior may affect herbicide transport in phloem and may affect herbicide efficacy.

Keywords: rice cut-grass; Peruvian water grass; water stress (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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