Genetic variability of nitrogen use efficiency in rainfed upland rice

Rakotoson, Tatiana; Dusserre, Julie; Letourmy, Philippe; Ramonta, Isabelle Ratsimiala; Cao, Tuong-Vi; Ramanantsoanirina, Alain; Roumet, Pierre; Ahmadi, Nourollah; Raboin, Louis-Marie

doi:10.1016/j.fcr.2017.07.023

Cited by 47 publications

(34 citation statements)

References 42 publications

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“…() and Rakotoson et al. (), the N uptake efficiency contributes more to NUE variation under low and high N availability, while N utilization efficiency contributes more under low N condition. From a physiological perspective, NUE is also influenced by the N dynamics within the plant.…”

Section: Introductionmentioning

confidence: 91%

Genetic diversity and path analysis for nitrogen use efficiency of tropical popcorn (Zea maysssp.everta) inbred lines in adult stage

et al. 2018

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Modern maize hybrid breeding is also focused on increasing nitrogen use efficiency (NUE) for grain production. The objectives of this study were to assess popcorn inbred lines for NUE, assess its genetic diversity for NUE and related traits, and investigate the relationship between vegetative and adult traits with NUE, under contrasting N levels. Nineteen inbreds were assessed for NUE and related traits under two contrasting N levels in a 2-year experiment, using complete blocks with three replications. Path analysis was performed using the vegetative N uptake and utilization efficiency and two root traits and four adult traits. The inbred 05-388 was the most efficient in N use under both N levels. The inbreds with higher N use and utilization efficiency, grain N content and post-silking N uptake were allocated in the same cluster in both N conditions. Leaf chlorophyll content and post-silking uptake can serve as target traits for identifying superior inbred lines for NUE. Vegetative N uptake and utilization efficiency, and total root length can be used for early selection of superior NUE inbreds. K E Y W O R D Sabiotic stress, leaf chlorophyll content, N dynamic, nitrogen use efficiency, root traits

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Section: Introductionmentioning

confidence: 91%

Genetic diversity and path analysis for nitrogen use efficiency of tropical popcorn (Zea maysssp.everta) inbred lines in adult stage

et al. 2018

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“…According to [5] the continuous application of N fertilizer at doses of 60 and 80 kg ha -1 year -1 in the dry season and the dry season limits the frequency and diversity of heterotrophic rhizosphere bacteria in the LARR (Long Aromatic Rice-Rice) planting system.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

The Effect of Indigenous Azotobacter Isolate on Rice Results of Sri and Land Quality Methods

Erlinda¹,

Elita²,

Agustamar³

2020

IJAR

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“…The panicles were hand threshed, and filled spikelets were separated from unfilled spikelets. The dry weights of filled spikelets and straw were determined after oven drying at 60°C for 72 h. As described in Rakotoson et al (2017), the concentration of N in the filled grain and in the straw at harvest was assessed by near-infrared spectrometry (Labspec 4 spectrometer; ASD Inc., Malvern Panalytical, UK) calibrated against a Dumas procedure using a Leco-N-analyzer (FP528; Leco Inc., St Joseph, USA). Crop N uptake was calculated as (grain yield × grain N content/100) (straw yield x straw N content/100).…”

Section: Measurementsmentioning

confidence: 99%

“…A previous experiment revealed the existence of significant genetic variability for N use efficiency (NUE) and its components (NUPE and NUTE) among a set of 13 varieties representative of the genetic diversity of the tropical japonica group adapted for upland cultivation at mid-altitude in Madagascar, including the variety NERICA 4 (Rakotoson et al, 2017). The relationship between NUE and agronomic and N-related traits differed from one year to the next, illustrating the plasticity of the contribution of the different agronomic traits to NUE as a function of the contrasted climatic conditions (particularly the rainfall distribution pattern).…”

Section: N Uptakementioning

confidence: 99%

Effects of contrasted cropping systems on yield and N balance of upland rainfed rice in Madagascar: Inputs from the DSSAT model

et al. 2020

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In response to the extensive development of upland rice on the hillsides of the Malagasy highlands, alternative cropping systems have been designed based on conservation agriculture (CA). As the promotion of CA in smallholder farming systems is still the subject of debate, its potential benefits for smallholder farmers require further assessment. In the context of resource-poor farmers and low-input production systems, nitrogen (N) is a major limiting nutrient. The effects of contrasted cropping systems have been studied on upland rice yield and N uptake in rainfed conditions: conventional tillage (CT) and CA with a mulch of maize or a legume (Stylosanthes or velvet bean). Decision Support Systems for Agrotechnology Transfer (DSSAT) crop growth model was used to quantify the soil N balance according to the season and the cropping system. The lowest yields were obtained in CA with a mulch of maize and were also associated with the lowest crop N uptake. Upland rice yields were higher or equivalent under CA with a legume mulch than under CT cropping systems. The supply of N was considerably higher in CA with a legume mulch than in CT, but due to higher leaching and immobilization in CA, the final contribution of N from the mulch to the crop was reduced although not negligible. DSSAT has been shown to be sufficiently robust and flexible to simulate the soil N balance in contrasting cropping systems. The challenge is now to evaluate the model in less contrasted experimental conditions in order to validate its use for N uptake and yield prediction in support to the optimization and design of new cropping systems.

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Genetic variability of nitrogen use efficiency in rainfed upland rice

Cited by 47 publications

References 42 publications

Genetic diversity and path analysis for nitrogen use efficiency of tropical popcorn (Zea maysssp.everta) inbred lines in adult stage

Genetic diversity and path analysis for nitrogen use efficiency of tropical popcorn (Zea maysssp.everta) inbred lines in adult stage

The Effect of Indigenous Azotobacter Isolate on Rice Results of Sri and Land Quality Methods

Effects of contrasted cropping systems on yield and N balance of upland rainfed rice in Madagascar: Inputs from the DSSAT model

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