Interactive Effects of CO₂ Enrichment and Nitrogen Levels on Leaf Gas Exchange Capacities of Sweet Potato

Journal of Agronomy and Crop Science, Journal Year: 2025, Volume and Issue: 211(2)

Published: Feb. 10, 2025

ABSTRACT Different nitrogen ( N ) doses may stimulate the photosynthetic responses of sweet potato under CO 2 ‐enriched environment (ECO ). The two varieties, Sree Arun and Kanaka, were adjudicated varying levels (0%, 25%, 50%, 100%, 125% recommended dose), exposed to ambient (400 ppm) elevated (600 800 ppm). results indicated that, compared , net rate P n intercellular C i significantly increased at ECO while stomatal conductance g s transpiration E exacerbated. This resulted in an improved intrinsic / instantaneous water use efficiency Relative humidity vapour pressure deficit during time measurements remained 73%–85% ~0.95–1.42 kPa, respectively, 28°C ± 2°C leaf temperature. Furthermore, demonstrated that higher photosynthesis plant relations by modulating rate. Overall, plants supply genotypic‐dependent, application could play important role these . findings from this study provide valuable insights for tailoring nitrogen‐based management practices a carbon‐enriched environment.

Language: Английский

Evaluating non-photochemical quenching (NPQ) kinetics and photosynthetic efficiency in cassava (Manihot esculenta) subjected to variable high light conditions

Functional Plant Biology, Journal Year: 2024, Volume and Issue: 51(10)

Published: Oct. 2, 2024

Light intensity is a critical environmental factor influencing plant growth and development. To survive high light conditions, plants have evolved various protective mechanisms, including non-photochemical quenching (NPQ). However, NPQ can limit effective photosynthetic yield when transitioning to low conditions. This phenomenon underexplored in cassava (Manihot esculenta), starchy storage root crop known for its biological efficiency climate resilience. address this knowledge gap, we assessed the photoprotective abilities responses of six varieties under natural conditions (control) intermittent (IHL) by adding 900 μmol m−2 s−1 using full-spectrum LED lights, on top ambient daylight. Our results demonstrated significant impact treatment aboveground biomass, total chlorophyll b content, rate, values during transitions from vice versa. Notably, variety ‘Sree Suvarna’ exhibited highest both control IHL These findings suggest that screening their ability postpone photoinhibition recover quickly may enhance performance. Such strategies important implications improving resilience crops, ultimately contributing sustainable agricultural productivity.

Language: Английский