Flag Leaf Senescence, as Evaluated by Numerical Image Analysis, and its Relationship with Yield under Drought in Durum Wheat

Hafsi, M.; Mechmeche, W.; Bouamama, Larbi; Djekoun, Abdelhamid; Zaharieva, M.; Monneveux, Philippe

doi:10.1046/j.1439-037x.2000.00436.x

Cited by 77 publications

(62 citation statements)

References 17 publications

(33 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many reports have demonstrated the phenotypic relationships between anthesis time, leaf senescence, and yield; however, only a few have presented their associations with individual grain weight, a major determinant of yield after anthesis (Gooding et al, 2000;McIntyre et al, 2010;Naruoka et al, 2012). In 2012, there was a significant association between leaf senescence rate and final individual grain weight, as suggested in durum wheat by Hafsi et al (2000). A detailed analysis showed that early anthesis, delayed but short and fast leaf senescence tended to increase grain filling rates, grain water absorption rate and in turn maximum grain water content, but shorten the progression of individual grain dry matter and water accumulation.…”

Section: Qtl Coincidences Reflect the Physiological Relationships Betmentioning

confidence: 99%

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Xie

Mayes

Sparkes

2016

Field Crops Research

View full text Add to dashboard Cite

Abbreviations: chl, chlorophyll; Chl accum , accumulated chlorophyll content; Chl loss , duration of rapid chlorophyll loss; Chl per , duration of chlorophyll persistence; Chl tot , total duration of chlorophyll persistence and loss; o Cd, degree day; GA, green area; GA accum , accumulated green area; GA loss , duration of rapid green area loss; GA per , duration of green area persistence;GA tot , total duration of green area persistence and loss; GF, grain filling; GFR, grain filling rate; H 2 , broad sense heritability; LOD, logarithm of the odds; Max chl, maximum chlorophyll content; Max CLR, maximum chlorophyll loss rate; Max GALR, maximum green area loss rate; MWC, maximum water content of grain; QTL, quantitative trait locus; RIL, recombinant inbred line; TGW, thousand grain weight; t max , the time at maximum grain filling rate; t mwc , the time at maximum water content; WAR, grain water absorption rate; WLR, grain water loss rate. 2 AbstractThe physiological process of how anthesis time and leaf senescence patterns affect individual grain weight of wheat has only been partially elucidated. In this study, a recombinant inbred line mapping population of bread wheat (Triticum aestivum L. 'Forno') and its relative spelt (Triticum spelta L. 'Oberkulmer'), contrasting for phasic development and leaf senescence kinetics, was used to understand the physiological and genetic relationships among anthesis time, leaf senescence, grain filling processes, and individual grain weight. Phenotypic measurements were taken in the field over two growing seasons. The results showed that earlier anthesis and delayed leaf senescence were associated with larger grains. Furthermore, early anthesis and delayed but fast leaf senescence promoted grain filling rate (but shortened its duration), grain water absorption rate and maximum grain water content, while individual grain dry matter and water accumulation displayed strong relationships with individual grain weight. A total of 118 significant quantitative trait loci (QTL) were identified in this mapping population, including six QTL for anthesis dates, 24 for flag leaf senescence, 69 for grain filling traits, and 19 for individual grain weight. Frequent QTL coincidences between these traits were observed on chromosomes 2A, 3B, 4A, 4DL, 5A, 5B, 5DL and 7B. Analysis of allelic effects confirmed the above physiological relationships. Therefore, anthesis time and leaf senescence affect individual grain weight at least partly through their effects on individual grain dry matter and water accumulation, resulting from pleiotropy or tight gene linkages. Slightly early anthesis, and delayed but fast leaf senescence, can be used to maximize individual grain weight and yield potential in wheat.

show abstract

Section: Qtl Coincidences Reflect the Physiological Relationships Betmentioning

confidence: 99%

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Xie

Mayes

Sparkes

2016

Field Crops Research

View full text Add to dashboard Cite

show abstract

“…Lukina et al (1999) used digital images to estimate the vegetation coverage and biomass of wheat, and Purcel (2000) compared captured images with under-canopy measurements of light for estimating total ground cover of soybean. Using digital cameras for the measurement of yield and nutrient status of wheat (Hafsi et al 2000;Jia et al 2004aJia et al , 2004b and corn (Daughtry et al 2000;Graeff et al 2001), for the measurement of the quality of turf grasses (Karcher and Richardson 2003), and for counting the number of flowers of cultivated Lesquerella fendleri (Adamsen et al 2000) underscores the utility and potential applications for such devices.…”

Section: Introductionmentioning

confidence: 99%

Use of a Networked Digital Camera to Estimate Net CO₂Uptake of a Desiccation‐Tolerant Moss

Graham

Hamilton²,

Mishler

et al. 2006

International Journal of Plant Sciences

View full text Add to dashboard Cite

Simple visible-light digital cameras offer a potential for expanded forms of plant ecological research. The moss Tortula princeps undergoes changes in reflected visible light during cycles of drying and hydrating in the field, and the MossCam project has collected digital images of T. princeps at least daily since 2003. Laboratory studies can be used to calibrate these images to indicate field physiological conditions. Drying the moss 6 d in the laboratory resulted in a decrease of net CO 2 uptake to near 0; recovery after rewetting occurred within 10 min. The difference in reflectance between hydrated and dry T. princeps was maximal ca. 550 nm, and maximal net CO 2 uptake was linearly related to the green : red ratio of laboratory images when net CO 2 uptake was positive. Using the green : red ratio of field images and otherwise assuming ideal conditions, the total carbon gain for a 6-d period around a 1.3-mm rain event was ca. 208 mmol CO 2 m ÿ2 , equivalent to 69 d of respiration under dry conditions. Using a visible-light digital camera with micrometeorological data and laboratory-based gas exchange measurements, T. princeps can be used as a model species for simple field estimations of photosynthesis, carbon gain, and phenological events.

show abstract

“…The latter were characterized with an excellent drought tolerance and maintained a high physiological potential. Considerable differences in the drought response in relation to senescence were reported also for various genotypes of maize (Messmer et al, 2011), millet (Dai et al, 2011), wheat (Hafsi et al, 2000;Verma et al, 2004), and alfalfa . The relevance of the recovery phase after an extended drought period was emphasized by several groups (Merewitz et al, 2010;Vassileva et al, 2011;Yao et al, 2012).…”

Section: Leaf Survival and Altered Timing Of Senescencementioning

confidence: 85%

Extreme climatic events: impacts of drought and high temperature on physiological processes in agronomically important plants

Feller

Vaseva

2014

Front. Environ. Sci.

103

View full text Add to dashboard Cite

Climate models predict more frequent and more severe extreme events (e.g., heat waves, extended drought periods, flooding) in many regions for the next decades. The impact of adverse environmental conditions on crop plants is ecologically and economically relevant. This review is focused on drought and heat effects on physiological status and productivity of agronomically important plants. Stomatal opening represents an important regulatory mechanism during drought and heat stress since it influences simultaneously water loss via transpiration and CO 2 diffusion into the leaf apoplast which further is utilized in photosynthesis. Along with the reversible short-term control of stomatal opening, stomata and leaf epidermis may produce waxy deposits and irreversibly down-regulate the stomatal conductance and non-stomatal transpiration. As a consequence photosynthesis will be negatively affected. Rubisco activase-a key enzyme in keeping the Calvin cycle functional-is heat-sensitive and may become a limiting factor at elevated temperature. The accumulated reactive oxygen species (ROS) during stress represent an additional challenge under unfavorable conditions. Drought and heat cause accumulation of free amino acids which are partially converted into compatible solutes such as proline. This is accompanied by lower rates of both nitrate reduction and de novo amino acid biosynthesis. Protective proteins (e.g., dehydrins, chaperones, antioxidant enzymes or the key enzyme for proline biosynthesis) play an important role in leaves and may be present at higher levels under water deprivation or high temperatures. On the whole plant level, effects on long-distance translocation of solutes via xylem and phloem and on leaf senescence (e.g., anticipated, accelerated or delayed senescence) are important. The factors mentioned above are relevant for the overall performance of crops under drought and heat and must be considered for genotype selection and breeding programs.

show abstract

Flag Leaf Senescence, as Evaluated by Numerical Image Analysis, and its Relationship with Yield under Drought in Durum Wheat

Cited by 77 publications

References 17 publications

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Use of a Networked Digital Camera to Estimate Net CO₂Uptake of a Desiccation‐Tolerant Moss

Extreme climatic events: impacts of drought and high temperature on physiological processes in agronomically important plants

Contact Info

Product

Resources

About

Flag Leaf Senescence, as Evaluated by Numerical Image Analysis, and its Relationship with Yield under Drought in Durum Wheat

Cited by 77 publications

References 17 publications

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Early anthesis and delayed but fast leaf senescence contribute to individual grain dry matter and water accumulation in wheat

Use of a Networked Digital Camera to Estimate Net CO2Uptake of a Desiccation‐Tolerant Moss

Extreme climatic events: impacts of drought and high temperature on physiological processes in agronomically important plants

Contact Info

Product

Resources

About

Use of a Networked Digital Camera to Estimate Net CO₂Uptake of a Desiccation‐Tolerant Moss