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Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
Crop and Pasture Science

Crop and Pasture Science

Volume 69 Number 7 2018

CP17418Screening wild progenitors of wheat for salinity stress at early stages of plant growth: insight into potential sources of variability for salinity adaptation in wheat

Jafar Ahmadi, Alireza Pour-Aboughadareh, Sedigheh Fabriki-Ourang, Ali-Ashraf Mehrabi and Kadambot H. M. Siddique
pp. 649-658

Despite numerous studies indicating that wild relatives of wheat respond well to salinity stress, no work has been undertaken to compare these species in response to this stress. We investigated the degree of resilience in an extensive collection of ancestral wheat accessions in terms of physiological parameters and enzymes that scavenge reactive oxygen species. Our results show that several wild relatives of wheat with alien genomes such as C, DC, and Ab had appropriate response to salinity stress by increasing enzymatic antioxidants.

CP17441Pseudomonas-aided zinc application improves the productivity and biofortification of bread wheat

Abdul Rehman, Muhammad Farooq, Muhammad Naveed, Levent Ozturk and Ahmad Nawaz
pp. 659-672

Inoculation of Pseudomonas with different Zn application methods enhanced the grain yield and quality of bread wheat. Seed priming and soil application of Zn with inoculation of Pseudomonas sp. MN12 improved the photosynthesis, organic acid production in root exudates and grain yield of wheat. Pseudomonas (sp. MN12) inoculation with soil and foliar application of Zn augmented the endospermic Zn concentration and estimated bioavailable Zn.

CP18098Intraspecific competition in oat varieties selected for grain yield and milling

Victor O. Sadras, M. Mahadevan and Pamela K. Zwer
pp. 673-680

High yield is often associated with low intra-specific competitive ability. Ten contemporary oat varieties, selected for grain yield and milling attributes, did not show correlation between yield and response to competition. This was partially due to high phenotypic plasticity in response to competition.

CP18144Grain yield stability of high-yielding barley genotypes under Egyptian conditions for enhancing resilience to climate change

Elsayed Mansour, Ehab S. A. Moustafa, Nehal Z. A. El-Naggar, Asmaa Abdelsalam and Ernesto Igartua
pp. 681-690

Additive main effects and multiplicative interaction and joint regression analyses were conducted to study genotype × environment interaction of barley in Egypt. Genotypes exhibited different genotype × environment interaction responses. Relationships between grain yield stability and duration of the growth cycle was examined.

CP17348Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions

Julius Pyton Sserumaga, Yoseph Beyene, Kiru Pillay, Alois Kullaya, Sylvester O. Oikeh, Stephen Mugo, Lewis Machida, Ismail Ngolinda, Godfrey Asea, Justin Ringo, Michael Otim, Grace Abalo and Barnabas Kiula
pp. 691-702

Climatic change has made farming riskier for millions of smallholder farmers who rely on rainfed crop production; thus, developing drought-tolerant varieties is one of the most important targets of crop improvement programs. This study evaluated the performance and stability of new drought-tolerant hybrids developed from Doubled Haploids (DH) technology in Uganda and Tanzania. Promising drought-tolerant hybrids, stable across production environments were identified to boost maize production in East Africa.

CP18117Modelled impacts of extreme heat and drought on maize yield in South Africa

Robert Mangani, Eyob Tesfamariam, Gianni Bellocchi and Abubeker Hassen
pp. 703-716

Two version of the crop model CropSyst (EMS, existing; MMS, modified) were assessed for their ability to simulate maize yield in South Africa under extreme heat and drought. Modified modelling solutions improved predictions by ~30% compared with EMS. Modelling solutions accounting for the impact of extreme weather events (MMS) can be seen as promising tools for supporting agricultural management strategies and policy decisions in South Africa.


To quantify the tensile properties of axial roots in maize, identifying the key factors influencing the maximum tensile force (Fmax) and tensile strength (Ts) of roots were investigated and the relationships among Fmax,Ts,diameter and turgid weight :  dry weight (TW : DW) ratio of roots were illuminated. It showed that the Fmax of roots on upper nodes was higher, and a positive linear correlation between Fmax and root diameter were observed. Also, there was a power function between Ts and root diameter and a negative exponential correlation between Ts and TW : DW ratio, respectively.

CP17438Dynamics of phytosterols content and concentration in sunflower grains

Raúl González Belo, Leonardo Velasco, Susana M. Nolasco and Natalia G. Izquierdo
pp. 724-732

Phytosterols are compounds of great relevance in food because they have been associated with a hypocholesterolemic effect. We observed environmental variability in phytosterols content and composition in sunflower, as the durations of the accumulation period of these components varied in accordance with the duration of oil accumulation period. These results reinforce the importance of environmental factor in determining oil quality in sunflower grains.

CP18040Effect of tree density on competition between Leucaena leucocephala and Chloris gayana using a Nelder Wheel trial. II. Belowground interactions

A. Nahuel A. Pachas, H. Max Shelton, Christopher J. Lambrides, Scott A. Dalzell, G. John Murtagh and Craig M. Hardner
pp. 733-744

Leucaena in combination with grass pasture is one of the most persistent, productive and sustainable grazing systems used in Queensland, Australia. This study evaluated the belowground interactions between leucaena and Rhodes grass when leucaena was planted at different tree densities. The experiment has demonstrated that both leucaena density and grass competition strongly influenced rooting patterns, water extraction and water use efficiency.

CP18055Recovery from short-term complete submergence in temperate pasture grasses

Gustavo G. Striker and Rocío A. Ploschuk
pp. 745-753

The ability to recover from 5-day submergence was assessed on pasture grasses. Dactylis glomerata and Bromus catharticus showed early leaf senescence and partial stomatal closure, and low shoot and root RGR. Schedonorus arundinaceus sustained high shoot RGR and fully adjusted its leaf functionality during recovery despite being affected during submergence. Phalaris aquatica presented dry mass unaffected by submergence, and unaltered stomatal conductance, leaf greenness, and shoot growth during recovery. In areas where flooding can cause plant submergence P. aquatica is recommended.

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