Current topics in drought physiology

Jones, Hamlyn G.; Corlett, J. E.

doi:10.1017/s0021859600012144

Cited by 114 publications

(56 citation statements)

References 47 publications

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“…Water deficit at both the vegetative and the anthesis stage has been shown to significantly reduce photosynthetic rates (Brar et al, 1990). Adaptive mechanisms to drought of plants may result in varying relationships between foliar gas exchange, seasonal pattern and crop productivity (Jones and Corlett, 1992). Humic acid influences respiration and photosynthesis, formation of complex with mineral ions, catalysis to enzymes, and stimulation of nucleic acid metabolism (Schnitzer and Khan, 1972).…”

Section: Resultsmentioning

confidence: 99%

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Delfine

Tognetti

Desiderio

et al. 2005

Agron. Sustain. Dev.

172

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-The aim of this study was to monitor the effect of foliar application of humic acid on plant growth, photosynthetic metabolism and grain quality of durum wheat grown in a Mediterranean-type climate. Four fertilization treatments were applied: a non-fertilized control, a crop fertilized with foliar application of humic acid, a crop fertilized with mineral N on soil at sowing, tillering and stem elongation, and a crop fertilized with foliar application of N (ammonium-nitrate solution). Aboveground plant mass accumulation was measured throughout two growing seasons, and grain quality parameters were tested at harvest time. Gas exchange, leaf protein content and Rubisco activity were monitored at different stages of plant development. Differences between years were often relevant due to weather conditions. The foliar application of humic acid caused a transitional production of plant dry mass with respect to unfertilized control and split soil N application. This effect was also evident for grain yield, spike fertility and grain protein content during the two years of the study. Humic acid never affected photosynthesis or stomatal conductance, while Rubisco activity and leaf protein content showed intermediate responses between unfertilized control and split soil N application. We conclude that humic acid had limited promoting effects on plant growth, grain yield and quality, and photosynthetic metabolism of durum wheat crops grown in a typical Mediterranean-type agro-ecosystem of southern Italy, with respect to split soil N application.humic acid / durum wheat / gas exchange / nitrogen / protein / Rubisco / grain quality

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Section: Resultsmentioning

confidence: 99%

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Delfine

Tognetti

Desiderio

et al. 2005

Agron. Sustain. Dev.

172

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“…In wheat plant , the amount of phot os ynt hesis reduced significantl y due t o drought str ess (Jones and Corlett , 1992) . Reduction of c hlor ophyll surface is mostl y due t o l ack of activit y i n phot os ynt hetic s yst em.…”

Section: Discussionmentioning

confidence: 99%

Seed priming with ascorbic acid or calcium chloride mitigates the adverse effects of drought stress in sunflower (Helianthus annuus L.) seedlings

Madany¹,

Khalil²

2017

Egypt. J. Exp. Biol. (Bot.)

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Ma hm oud M. Y. M ad an y R ad w an R . K h al i lSeed priming with as corbic a cid or calciu m chlorid e mitigates th e adv erse effects of drought stre ss in sunflo wer ( Helia nthus annuu s L.) seedling s ABSTRACT:Drought stress is one of the m ost import ant fact ors limiting the surviv al and growth of plants i n differ ent habitat s of Eg ypt. T his stud y was c arried out to inves tigat e the ef fec t of drought stres s on growt h and som e metab olic activities of s unflow er s eedlings under treatm ents wit h asc orbic acid ( As A) or CaCl2. Drought s tress s how ed a m arked reduction in shoot length, leaf area, shoot fresh and dr y weight, p hotos ynt hetic pigments, sol uble sugar, and am yl as e activit y. On t he other hand, r oot l engt h, sol uble proteins , prot ease ac tivit y, proline c ont ent , soluble phenolics and flav onoid c ontents , phenyl alanine ammonia l yase ( PA L), peroxidas e (P OX), pol yphenol oxidase (P PO) activities, H2O2 and Malondialdehyd e (MD A) contents , and tot al anti oxidant cap acit y wer e induced c ompar ed with normal plant. The application of As A or CaCl 2 mitigat ed the drought s tress thr oughout t he increas e of growth crit eria, antioxidant enz ym es and phot os ynt hetic pigments and decr eas ed of H2O2, Malondialdehyd e ( MDA), sol uble phenolics and flav onoid c ont ents.

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“…Nutrients usually concentrate in the soil surface layers and their absorption is made easier because of higher microbial activity [8]. From a recent study it appears that phosphorus (P) acquisition is less in deeper-rooted plants than in shallow-rooted because, phosphate tends to reside mainly in the upper most soil layer which is most vulnerable to drying out [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Soil Water Deficit and Phosphorus Application on Phosphorus Uptake and Yield of Soybean (<i>Glycine max</i> L.) at Dejen, North-West Ethiopia

Getachew¹

2014

AJPS

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A green house experiment was conducted at Dejen, Northwest Ethiopia, with the objective of quantifying the critical soil water deficit and P levels that affect yield and yield components of soybean, and determine the critical soil water deficit levels influencing P uptake in soybean. The treatment consisted of factorial combination of four available soil water (ASW) deficit levels (0%, 25%, 50% and 75%) and four levels of phosphorus (0, 10, 20, and 30 kg•ha −1 ) laid out in RCBD with four replications using soy bean variety Jalale as a planting material. The experiment was conducted under green house condition at Dejen, South Ethiopia during the 2011 academic year. Air dried soil was filled in the pots and seeds were sown on May 13, 2011. Four plants were maintained on each pot after thinning till flowering but after flowering, the total number of plants per pot was reduced to three as one plant which was used for measurement of root biomass. The water deficit treatments were imposed after the plants have been fully established 2 weeks after emergence just before branching stage. The water deficiency was imposed through maintaining the soil moisture content below field capacity at the deficit levels of 25%, 50% and 75%. The 75% of ASW deficit resulted in the longest days (45) to flowering and maturity (99) compared to the 0%, 25% and 50% deficit levels. Also, the 75% of ASW deficit level resulted in shorter plants (55 cm), the lowest leaf area (82.6 cm 2 ), the highest root to shoot ratio (0.0168) and the lowest DM accumulation (161.3 gm −2 ) compared to the other ASW deficit levels. Likewise, the 75% of ASW deficit level gave the lowest number of pods per plant (4.13), seeds per pod (1.69), 100 seed weight (2.54 g), seed yield (13.4 g•m −1 ), above ground biomass (174.6 g•plant −1 ) and harvest index (0.08) compared to the other ASW deficit treatments. The degree of sensitivity to drought increased dramatically (from 0.0423 at 25% to 0.9604 at 75%) with increase in water deficit level. Tissue analysis results indicated that the highest seed P concentration (1.285%) and uptake (432.5 g•plant −1 ) were ob-M. Getachew 1890 tained at the 0 ASW deficit and 30 kg•P•ha −1 and the lowest were obtained at 75% ASW deficit and all rate of applied P. On the contrary, the highest straw P concentration (1.88%) and uptake (552.7 g•plant −1 ) were recorded at 75% and 25% of ASW deficit levels and 30 kg•P•ha −1 , respectively. However, the total P uptake was influenced only by ASW deficit levels in that the relatively minimum and maximum values were observed at 75% and 0% of ASW deficit levels, respectively. It can be concluded that the critical ASW deficit levels that affect yield and yield components of soybean and uptake of total P lie between 25% and 50% of available water deficit levels. The parameters started to decline significantly from the 50% of ASW deficit onwards. As it is a green house experiment, further study on more number of ASW deficit levels and soil types under different field conditions needs to be ...

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Current topics in drought physiology

Cited by 114 publications

References 47 publications

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Seed priming with ascorbic acid or calcium chloride mitigates the adverse effects of drought stress in sunflower (Helianthus annuus L.) seedlings

Influence of Soil Water Deficit and Phosphorus Application on Phosphorus Uptake and Yield of Soybean (<i>Glycine max</i> L.) at Dejen, North-West Ethiopia

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Current topics in drought physiology

Cited by 114 publications

References 47 publications

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Effect of foliar application of N and humic acids on growth and yield of durum wheat

Seed priming with ascorbic acid or calcium chloride mitigates the adverse effects of drought stress in sunflower (Helianthus annuus L.) seedlings

Influence of Soil Water Deficit and Phosphorus Application on Phosphorus Uptake and Yield of Soybean (&lt;i&gt;Glycine max&lt;/i&gt; L.) at Dejen, North-West Ethiopia

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Influence of Soil Water Deficit and Phosphorus Application on Phosphorus Uptake and Yield of Soybean (<i>Glycine max</i> L.) at Dejen, North-West Ethiopia