Plasticity of root growth and respiratory activity: Root responses to above-ground senescence, fruit removal or partial root pruning in soybean
Autor: | Carlos Guillermo Bartoli, Diego Darío Fanello, María Gabriela Cano, Juan José Guiamet, Santiago Manuel Martínez Alonso, Santiago Julián Kelly |
---|---|
Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
0301 basic medicine Senescence Aging senescence Nitrogen assimilation NITROGEN ASSIMILATION Plant Science Biology Plant Roots 01 natural sciences ROOT PRUNING purl.org/becyt/ford/1 [https] 03 medical and health sciences Basal (phylogenetics) Depodding Respiration Genetics Dry matter Root pruning purl.org/becyt/ford/1.6 [https] ROOTS Plant senescence Reproduction Botánica fungi DEPODDING food and beverages General Medicine Roots Horticulture 030104 developmental biology Point of delivery RESPIRATION SENESCENCE Fruit Soybeans Agronomy and Crop Science Pruning 010606 plant biology & botany |
Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
ISSN: | 0168-9452 |
Popis: | This work focuses on the alterations in soybean root growth and activity during whole plant senescence and the contribution of roots to source-sink relations during plant development. The experiments were designed to analyze the activity of roots in relation to: a) whole plant senescence, b) total pod removal and c) root pruning (15, 25 and 50% of DW) during seed growth stages. Roots can grow until an advanced R5 stage and their specific activity decreases along the reproductive development but whole root activity declines from R6. However root respiration is maintained at a basal level until R8. Depodded plants showed a large increase of root dry matter (about 470%) and a large increase of AOX protein. Root pruning treatments showed a proportional increase of specific root respiration in 25 and 50% treatments but no differences of whole root respiration and dry matter partitioning at R7. These results indicate that roots are under the control of the requirements of above ground organs until final stages of seed growth but, after this, roots may survive independently for some time. This suggests that roots do not suffer a senescence-like process as leaves do. Also, plants have a high capacity to buffer changes in root biomass production and specific root activity under pod removal or partial root pruning. Instituto de Fisiología Vegetal |
Databáze: | OpenAIRE |
Externí odkaz: |