Ontogeny of the digestive tract of Centropomus parallelus larvae     

Andressa Teles  Wanessa Melo Costa  Dib Ammar  Yara M. Rauh Müller  Evelise M. Nazari  Vinicius Ronzani Cerqueira 《Fish physiology and biochemistry》2015,41(2):549-559

  相似文献   

Transpiration response of two bread wheat lines differing in drought resilience and their backcross parent under dry-down conditions     

Michael O. Itam  Ammar Wahbi  Haruyuki Fujimaki  Hisashi Tsujimoto 《Breeding Science》2021,71(5):575

Improving wheat productivity in drylands largely depends on how plants manage limited water resources. Using fraction of transpirable soil water threshold (FTSW_Th) and drought stress response function, we characterized the water conservation traits of two wheat multiple synthetic derivative lines (MSD53 and MSD345) which both contain introgressed segments from Aegilops tauschii but differ in drought resilience. The lines and their backcross parent, ‘Norin 61’, were subjected to dry-down conditions. MSD53 had a higher FTSW_Th for transpiration decrease than ‘Norin 61’ and MSD345. In terms of drought stress response function, MSD53 had the lowest threshold suction, suggesting a lower drought resilience capacity compared with MSD345. However, MSD53 exhibited an effective-water-use trait whereas MSD345 exhibited a water-saving trait under dry-down conditions. These results are consistent with the reported higher yield of MSD53 in comparison with MSD345 under drought stress in Sudan, and demonstrate that high FTSW_Th supports effective water use for improved agricultural productivity in drylands. The differences in water conservation traits between the two MSD lines may be attributed to variation in introgressed segments, which can be further explored for drought resilience breeding.  相似文献   

Effect of allele combinations at Ppd-1 loci on durum wheat grain filling at contrasting latitudes     

Jose M. Arjona  Conxita Royo  Susanne Dreisigacker  Karim Ammar  Joan Subirà  Dolors Villegas 《Journal of Agronomy and Crop Science》2020,206(1):64-75

Flowering time is the most critical developmental stage in wheat, as it determines environmental conditions during grain filling. Thirty-five spring durum genotypes carrying all known allele variants at Ppd-1 loci were evaluated in fully irrigated field experiments for three years at latitudes of 41°N (Spain), 27°N (northern Mexico) and 19°N (southern Mexico). Relationships between weight of central grains of main spikes (W) and thermal time from flowering to maturity were described by a logistic equation. Differences in flowering time between the allele combination causing the earliest (GS100/Ppd-B1a) and the latest (Ppd-A1b/Ppd-B1a) flowering were 7, 20 and 18 days in Spain, northern Mexico and southern Mexico, respectively. Flowering delay drastically reduced the mean grain filling rate (R) and W at all sites. At autumn-sowing sites, an increase of 1°C in mean temperature during the first half of the grain filling period decreased W by 5.2 mg per grain. At these sites, W was strongly dependent on R. At the spring-sowing site (southern Mexico), W depended on both R and grain filling duration. Our results suggest that incorporating the allele combinations GS100/Ppd-B1a and GS105/Ppd-B1a (alleles conferring photoperiod insensitivity) in newly released varieties can reduce the negative effects of climate change on grain filling at the studied latitudes.  相似文献   

Genotype by environment interactions (GEIs) for barley grain yield under salt stress condition     

Ammar Elakhdar  Toshihiro Kumamaru  Kevin P. Smith  Robert S. Brueggeman  Ludovic J.A. Capo-chichi  Shyam Solanki 《Journal of Crop Science and Biotechnology》2017,20(3):193-204

Changes in the relative genetic performance of genotypes across environments are referred to as genotype × environment interactions (GEIs). GEIs can affect barley breeding improvement for salt tolerance because it often complicates the evaluation and selection of superior genotypes. The present study evaluated the GEIs over 60 barley genotypes for yield components and grain yield in six salinity environments in North Delta, Egypt. Data were analyzed using the additive main effects and multiplicative interaction (AMMI) and Tai’s stability parameters. GEIs effects on yield explained 20.3, 20.1, 14.6, and 33.0% of the total variation besides, the first two principal components account for 67.3, 56.3, 64.3, and 83.7% of the explained variance in the four sets, respectively. Six genotypes namely G-4, G-7, G-20, G-34, G-36, and G-39 were found to be most stable and high yielding across environments (GY >2.00 t ha^-1), and located close to zero projection onto the AEC ordinate. Tai’s stability parameters demonstrated that these genotypes were more responsive to the environmental changes. The genotypes G-50 and G-53 showed perfect/static stability (α = -0.95, -0.91, respectively). In contrast, the genotype; G-36 had α = 0 and λ = 1.10, indicating parallel with the environmental effects followed by G-44. Overall, we found that GEIs for grain yield are highly significant in all sets, suggesting that responded differently across environments. This interaction may be a result of changes in genotypes’ relative performance across environments, due to their differential responses to various abiotic factors.  相似文献   

Phenolic Profiles,Phytchemicals and Mineral Content of Decoction and Infusion of Opuntia ficus-indica Flowers     

Imene Ammar  Monia Ennouri  Mohamed Bouaziz  Amal Ben Amira  Hamadi Attia 《Plant foods for human nutrition (Dordrecht, Netherlands)》2015,70(4):388-394

  相似文献   

Mycoplasmas from donkeys and horses in the Sudan     

H E Shams el Din  M el Nasri 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,43(3):323-324

Seventeen isolates (4.27%) were recovered from 398 samples. Twelve isolates (4%) were obtained from 300 donkey nasal swabs, three (4.3%) and two (6.89%) isolates were recovered from 69 horse nasal swabs and 29 mare uterine washings, respectively. Nine isolates were lost during storage at -20 degrees C and the remaining eight were identified as mycoplasmas and their biological, biochemical and serological reactions were investigated. The isolates could be divided into two groups on the basis of glucose fermentation and arginine hydrolysis. The first group neither fermented glucose nor hydrolysed arginine. Organisms in the second group hydrolysed arginine only.  相似文献   

TDP-43 mutations in familial and sporadic amyotrophic lateral sclerosis   总被引：1，自引：0，他引：1  

Sreedharan J  Blair IP  Tripathi VB  Hu X  Vance C  Rogelj B  Ackerley S  Durnall JC  Williams KL  Buratti E  Baralle F  de Belleroche J  Mitchell JD  Leigh PN  Al-Chalabi A  Miller CC  Nicholson G  Shaw CE 《Science (New York, N.Y.)》2008,319(5870):1668-1672

Amyotrophic lateral sclerosis (ALS) is a fatal motor neuron disorder characterized pathologically by ubiquitinated TAR DNA binding protein (TDP-43) inclusions. The function of TDP-43 in the nervous system is uncertain, and a mechanistic role in neurodegeneration remains speculative. We identified neighboring mutations in a highly conserved region of TARDBP in sporadic and familial ALS cases. TARDBPM337V segregated with disease within one kindred and a genome-wide scan confirmed that linkage was restricted to chromosome 1p36, which contains the TARDBP locus. Mutant forms of TDP-43 fragmented in vitro more readily than wild type and, in vivo, caused neural apoptosis and developmental delay in the chick embryo. Our evidence suggests a pathophysiological link between TDP-43 and ALS.  相似文献   

Cadmium Uptake and Translocation of Tomato in Response to Simulated Irrigation Water Containing Elevated Concentrations of Cadmium and Zinc in Clayey Soil     

Mamoun A. Gharaibeh  Ammar A. Albalasmeh  Bernd Marschner  Yasmeen Saleem 《Water, air, and soil pollution》2016,227(5):133

  相似文献   

Dynamics of macronutrients in olive leaves     

Karima Bouhafa  Lhoussaine Moughli  Rachid Bouabid  Ahmed Douaik  Youness Taarabt 《Journal of plant nutrition》2018,41(8):956-968

The study aims to track the dynamics of the olive leaf nitrogen (N), phosphorus (P) and potassium (K) for five olive varieties under drip irrigation in farmer's fields in central Morocco. Leaf sampling was done every month from May 2014 to April 2015. Leaf macronutrients contents showed variation over time. Olive leaves have maintained the same N content throughout the study period indicating a continuing olive uptake of nitrogen. Higher leaf P absorption was observed during flowering and fruit magnification periods indicating the important P needs of olive during these periods. Olive leaf K levels were higher from September to December indicating the high K needs of olive. No variety effect was revealed on the leaf N, P and K contents. Very highly significant differences were found between the leaf N and K levels measured at different sampling periods. The leaf P concentration was statistically equal in all measuring periods.  相似文献   

Genome wide association study of grain yield and yield related traits in spring bread wheat (Triticum aestivum L.) under drought and heat conditions in three different locations     

El Gataa  Zakaria  El Hanafi  Samira  Basheer  Fadil  Kehel  Zakaria  bouhouch  Yassin  El Messoadi  Khalil  Eddakir  Kenza  Ladraa  Nawel  Samir  Karima  Tadesse  Wuletaw 《Journal of Crop Science and Biotechnology》2021,24(4):361-373

Journal of Crop Science and Biotechnology - Abiotic stress, especially drought and heat, affects cereal yields and wheat production worldwide, more particularly in West and South Asia, North...  相似文献