Relationship between leaf water spin‐lattice relaxation time and water relation parameters in three wheat cultivars

Nagarajan, S.; Chahal, S. S.; Gambhir, P. N.; Tiwari, P. N.

doi:10.1111/j.1365-3040.1993.tb00848.x

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…Nuclear magnetic resonance (NMR) spectroscopy offers a non-destructive and non-invasive method for characterization of water status in many biological tissues, including seeds (Brosio et al, 1992;Nagarajan et al, 1993;Fukuoka et al, 1994;Gambhir et al, 1997;Krishnan et al, 2003). Longitudinal and transverse relaxation behaviour of water protons can be investigated to describe the compartmentation and transport of water in tissues.…”

Section: Introductionmentioning

confidence: 99%

Characterization of water status in primed seeds of tomato (Lycopersicon esculentum Mill.) by sorption properties and NMR relaxation times

Nagarajan

Pandita²,

Joshi

et al. 2005

Seed Sci. Res.

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The enhanced laboratory and field emergence characteristics of osmo- and halo-primed tomato seeds (cv. Pusa Ruby) were related to changes in hydration–dehydration kinetics, modified sorption properties and nuclear magnetic resonance (NMR) relaxation behaviour of humidified and imbibed seeds. Water sorption isotherms were constructed for primed and unprimed seeds by equilibrating to different water activities (aw) at 25°C. Analysis of the isotherms by the D'Arcy–Watt equation revealed that priming reduced the number of strong binding sites and the associated water content, and increased significantly the number of weak binding sites and the associated water content. This redistribution of water, which increased the availability of seed water, may be the reason for the higher speed of germination of primed seeds. The changes in transverse relaxation time (T2) of seed water and its components, measuredin vivousing nuclear magnetic resonance spectroscopy, showed interesting differences between primed and unprimed seeds. With an increase in humidification time, the T2of primed seeds could be resolved into three components with varying mobilities, while the control seeds had only two components until 10 d of humidification. During imbibition, the third component appeared after 2 and 6 h in primed and control seeds, respectively. This component disappeared after the germination process started in all treatments. The third fraction, with very low molecular mobility, which accounted for about 40% of the proton population, was assigned to hydration water of macromolecules. Hence, we propose that better performance of primed seeds may be attributed to the modifications of seed water-binding properties and reorganization of seed water during imbibition, so as to increase the macromolecular hydration water required for various metabolic activities related to the germination process.

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Section: Introductionmentioning

confidence: 99%

Characterization of water status in primed seeds of tomato (Lycopersicon esculentum Mill.) by sorption properties and NMR relaxation times

Nagarajan

Pandita²,

Joshi

et al. 2005

Seed Sci. Res.

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“…protein and sugars in plant tissues. Better performances of primed seeds are attributed to the modifications of seed water availability and binding properties (Nagarajan et al 1993). Matsunami et al (2021) studied the role of aquaporins (AQPs), transmembrane proteins that serve as water channels allowing rapid and passive movement of water in seed water metabolism.…”

Section: Biophysical and Structural Changesmentioning

confidence: 99%

Seed Vigour and Invigoration

Basu

Groot

2023

Seed Science and Technology

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Seed vigour is an important aspect of seed quality. It is a quantitative trait which is responsible for overall seed performance in terms of rate and uniformity of seed germination, seedling growth, emergence ability under unfavourable environments and post storage performance. Seed vigour is controlled by genetic factors, initial seed quality, production environments, harvesting and storage conditions. Seed vigour tests provide a more sensitive index of seed performance per se than the germination test. Efforts have been focused on developing novel or improving existing methods of vigour estimation in different crops. The vigour tests are tools routinely used for in-house seed quality control programs, especially for field and vegetable crops. Some treatments can improve seed vigour, although the treatment effects are more evident under sub-optimum than optimum growing conditions. This chapter deals with different aspects of seed vigour and its effects on plant growth and discusses physiological and biochemical parameters to understand underlying mechanisms.

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“…The c s of the plant materials was determined according to Nagarajan et al (1993) using pre-calibrated vapor pressure osmometer (5500 Wescor, UT, USA).…”

Section: Measurement Of Osmotic Potential ðW S þmentioning

confidence: 99%

Developing embryos of Sesbania sesban have unique potential to photosynthesize under high osmotic environment

Puthur¹,

Saradhi

2004

Journal of Plant Physiology

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Relationship between leaf water spin‐lattice relaxation time and water relation parameters in three wheat cultivars

Cited by 10 publications

References 12 publications

Characterization of water status in primed seeds of tomato (Lycopersicon esculentum Mill.) by sorption properties and NMR relaxation times

Characterization of water status in primed seeds of tomato (Lycopersicon esculentum Mill.) by sorption properties and NMR relaxation times

Seed Vigour and Invigoration

Developing embryos of Sesbania sesban have unique potential to photosynthesize under high osmotic environment

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