Growth and Photosynthesis Responses of a Super Dwarf Rice Genotype to Shade and Nitrogen Supply

Schmierer, Marc; Knopf, Oliver; Asch, Folkard

doi:10.1016/j.rsci.2021.01.007

Cited by 14 publications

(8 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several authors have highlighted the advantages of a high SLA for photosynthesis. Evans and Poorter (2001) demonstrated that a high SLA is important for maximum carbon gain per unit leaf mass, especially at low‐light conditions (Schmierer et al., 2021). While thicker leaves have more structural material relative to metabolic components and increased internal shading, leading to lower light absorption (Terashima & Hikosaka, 1995), they also slow down intercellular gaseous diffusion, which probably limits CO 2 assimilation (Parkhurst, 1994).…”

Section: Discussionmentioning

confidence: 99%

Leaf gas exchange of lowland rice in response to nitrogen source and vapor pressure deficit

Stuerz

Pieters

et al. 2021

J. Plant Nutr. Soil Sci.

Self Cite

View full text Add to dashboard Cite

Background In anaerobic lowland fields, ammonium (NH4+) is the dominant form of nitrogen (N) taken up by rice plants, however, with the large expansion of water‐saving irrigation practices, nitrification is favored during drained periods, leading to an increased availability of nitrate (NO3−). Aim Since the uptake and assimilation of the two N‐sources differ in their demand of photosynthates, leaf gas exchange may be subject to adjustments in response to N‐sources, particularly at high evaporative demand, when stomatal conductance (gs) is very sensitive. Methods Three experiments were carried out to study leaf gas exchange of various lowland rice varieties in response to N‐source at low and high vapor pressure deficit (VPD). In the first experiment, seedlings of 12 rice varieties were grown at high VPD for 3 weeks. From this, four rice varieties differing in gs and CO2 assimilation rate (A) were selected and grown for 2 weeks at low VPD, and after that, they were shifted to high VPD for 1 week, whereas in the third experiment, the same varieties were grown separately at low and high VPD conditions for 2 weeks. In all three experiments, plants were grown hydroponically in nutrient solution with N‐sources as sole NH4+ or NO3−. Results At high VPD, NO3− nutrition led to a higher gs and A in four out of 12 varieties (IR64, BT7, NU838, and Nipponbare) relative to NH4+ nutrition, while no effect was observed at low VPD or after a short‐term exposure to high VPD. Further, varieties with a high intrinsic water‐use efficiency (WUEi; IR64 and BT7) showed the strongest response to N‐source. Higher gs was partially supported by increased root/shoot ratio, but could not be fully explained by the measured parameters. However, higher A in NO3−‐fed plants did not always result in increased plant dry matter, which is probably related to the higher energy demand for NO3− assimilation. Our results suggest that at high VPD, NO3− nutrition can improve leaf gas exchange in varieties having a high WUEi, provided a sufficient water supply. Conclusion Therefore, intensified nitrification under water‐saving irrigation measures may improve leaf gas exchange and the growth of rice plants under high transpirational demand. However, choice of variety seems crucial since large varietal differences were observed in response to N‐source. Further, breeding strategies for genotypes adapted to aerobic soil conditions should consider responses to NO3−, potentially using gas exchange measurements as a screening tool.

show abstract

Section: Discussionmentioning

confidence: 99%

Leaf gas exchange of lowland rice in response to nitrogen source and vapor pressure deficit

Stuerz

Pieters

et al. 2021

J. Plant Nutr. Soil Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…) during kharif, 2019. The yield reduction at low light intensity is mainly due to reduction in grain weight [24]. According to Hairmansis et al [23] 55% shade enhanced the blooming time, the height of plant and spikelet sterility but reduce number of productive tillers and Yield.…”

Section: Grain Yieldmentioning

confidence: 98%

“…It's because, solar radiation in tropics is one of the major climatic factors limiting grain yield in rice, therefore the present study was designed to understand the leaf chlorophyll changes under 75% and 50% light intensity in comparison to 100% light intensity and yield performance of 11 long duration rice varieties under decreased light intensity. Yield reduction in shaded conditions is more (32.2%-65%) than normal light conditions due to reduction in number of viable pollen and productive tillers [22][23][24]. Therefore the present experiment was designed to study the Low light effect on the leaf chlorophyll, antioxidant enzymes (Catalase, Peroxidase, SOD) and grain yield of long duration rice cultivars.…”

Section: Introductionmentioning

confidence: 99%

Effect of Low Light Stress on Leaf Chlorophyll a, b, a+b, a/b, Catalse, Peroxidase, SOD and Yield of Long duration Rice Varieties (Oryza sativa L.)

Dash

Pattnaik

Panda

et al. 2022

IJPSS

View full text Add to dashboard Cite

Light has a significant role in growth and development of plants because of its crucial role in photosynthesis and photo morphogenesis. If the amount of light intensity reaches the plants is reduced than the optimum level then it creates low light stress for plants and this problem is identified in the eastern and north-eastern region of India which is the major rice belt in our country. Therefore the present experiment was conducted during Kharif 2019 at plot no-4, Block-V of Department of Crop Physiology and Biochemistry, NRRI, Cuttack to study the Low light effect on the biochemical changes and grain yield of long duration rice cultivars. In the present research, 9 long duration rice varieties along with 2 check varieties were exposed to 75% light and 50% light condition in comparison to control (100% light) to know the leaf chlorophyll behaviour and yield during kharif (July‒November, 2019). Plants were grown in field condition with shade installation done 15days after transplanting to impose low light stress in plants. Among the varieties, Swarnaprabha was found with the highest total chlorophyll content in 100% L (2.311 mg g-1 fresh weight), 75% L (2.705 mg g-1 fresh weight) and 50% L (3.684 mg g-1 fresh weight) at 50% flowering stage. Similarly, Swarnaprabha was recorded with the highest chlorophyll at 7 days after 50% flowering. In both the cases, low light induced more chlorophyll in plants than normal light. Among the antioxidant enzymes, Peroxidase and Catalase exhibited an increased activity under low light stress, whereas Superoxide dismutase (SOD) exhibited decreased activity in low light stress. Besides, higher yield was recorded in normal light condition than 75% light and 50% light condition. Among the varieties Nasati Sali leads with higher yield in 100% (5.10 t ha-1) and 75% (4.27 t ha-1) light condition. On the other hand Swarnaprabha (3.05 t ha-1) having highest yield at 50% light intensity.

show abstract

“…Chlorophyll fluorescence imaging has been widely reported to monitor plant growth and response to stress [5]. While used already, investigations on chlorophyll fluorescence continue to be extended in various directions including the search for new sequences of illumination protocols [7], the physiological interpretation of image signature [8], the genetic determinism associated with chlorophyll fluorescence signals [9,10] or the fundamental biomolecular mechanisms at work [9,11]. We position this article in this trend of further investigations of chlorophyll fluorescence but here at the level of the mathematical modeling of the statistics observed in chlorophyll fluorescence indices.…”

Section: Introductionmentioning

confidence: 99%

On the Importance of Non-Gaussianity in Chlorophyll Fluorescence Imaging

et al. 2023

View full text Add to dashboard Cite

We propose a mathematical study of the statistics of chlorophyll fluorescence indices. While most of the literature assumes Gaussian distributions for these indices, we demonstrate their fundamental non-Gaussian nature. Indeed, while the noise in the raw fluorescence images can be assumed as Gaussian additive, the deterministic ratio between them produces nonlinear non-Gaussian distributions. We investigate the states in which this non-Gaussianity can affect the statistical estimation when wrongly approached with linear estimators. We provide an expectation–maximization estimator adapted to the non-Gaussian distributions. We illustrate the interest of this estimator with simulations from images of chlorophyll fluorescence indices.. We demonstrate the benefits of our approach by comparison with the standard Gaussian assumption. Our expectation–maximization estimator shows low estimation errors reaching seven percent for a more pronounced deviation from Gaussianity compared to Gaussianity assumptions estimators rising to more than 70 percent estimation error. These results show the importance of considering rigorous mathematical estimation approaches in chlorophyll fluorescence indices. The application of this work could be extended to various vegetation indices also made up of a ratio of Gaussian distributions.

show abstract

Growth and Photosynthesis Responses of a Super Dwarf Rice Genotype to Shade and Nitrogen Supply

Cited by 14 publications

References 45 publications

Leaf gas exchange of lowland rice in response to nitrogen source and vapor pressure deficit

Leaf gas exchange of lowland rice in response to nitrogen source and vapor pressure deficit

Effect of Low Light Stress on Leaf Chlorophyll a, b, a+b, a/b, Catalse, Peroxidase, SOD and Yield of Long duration Rice Varieties (Oryza sativa L.)

On the Importance of Non-Gaussianity in Chlorophyll Fluorescence Imaging

Contact Info

Product

Resources

About