Kiehr M¹, R Delhey¹, J Lusto², PJ Paoloni³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 199-202, 2010, DOI:10.32604/phyton.2010.79.199

Abstract A report is given on host plants, distribution, damage and importance of Sclerotinia minor in the southern Pampas and northern Patagonia regions (Argentina). Spontaneous infections were recorded on seven plant species. Sonchus oleraceus and Eruca vesicaria are new hosts for S. minor; Cichorium intybus and Zinnia elegans are new hosts for Argentina. This fungus causes important damage on Helianthus annuus and Lactuca sativa, and it occasionally affects C. intybus and Solanum lycopersicum. Comparative in vitro and in planta studies were carried out with S. minor and S. sclerotiorum isolates obtained from sunflower. More >

Torres¹ YA, CA Busso¹, OA Montenegro², HD Giorgetti², HD Rodríguez², D Bentivegna³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 195-198, 2010, DOI:10.32604/phyton.2010.79.195

Abstract Osmotic adjustment has been recognized to be an important adaptive response to water stress in higher plants. Although Leymus cinereus cv. “Trailhead” is reputedly a very drought-tolerant rangeland plant, its ability to adjust osmotically in the field has not previously been reported. This study examined the occurrence or not of osmotic adjustment in field-grown plants of Leymus cinereus cv. “Trailhead” during late spring in an arid zone of Patagonia. Plants of this species had been established in the field three years before. With this purpose, leaf laminae of this species were collected and pressure-volume curves made. Results More >

Maanda MQ, RB Bhat

Phyton-International Journal of Experimental Botany, Vol.79, pp. 189-194, 2010, DOI:10.32604/phyton.2010.79.189

Abstract We studied the marginal utilization of 40 wild vegetable species in the Venda area of Limpopo Province (South Africa). Use of these vegetables with various purposes by humans is indicated. More >

Mirassón¹ HR, ML Faraldo¹, MN Fioretti², M Miravalles², RE Brevedan²

Phyton-International Journal of Experimental Botany, Vol.79, pp. 183-187, 2010, DOI:10.32604/phyton.2010.79.183

Abstract Tillage system is an important management decision that has to be taken in the central, semiarid, temperate region of Argentina for dryland wheat production. A 2-year study was conducted on an Entic Haplustoll soil with a sandy loam texture to determine the effects of three tillage systems (conventional, vertical and notillage) on leaf water status and chlorophyll content. Measurements were made at the Z65 growth stage with a SPAD-502; leaf water potential measurements were simultaneously taken. There was a positive relationship between leaf water potential and leaf greenness in both years. Tillage systems were significantly More >

Sadia^1,3 B, PC Josekutty², SD Potlakayala², P Patel², S Goldman³, SV Rudrabhatla²

Phyton-International Journal of Experimental Botany, Vol.79, pp. 177-181, 2010, DOI:10.32604/phyton.2010.79.177

Abstract A robust protocol for culturing meristems of Sorghum is required to assist with rapid genetic improvement of the genus. Through meristem culture, an efficient method for rapid micropropagation was developed for Sorghum bicolor (L.) Moench. hybrids, namely NC+262, NC+6C21 and NC+6B50. Complete plants were regenerated directly from shoot meristems without an intervening callus phase. Regeneration frequencies varied between the studied genotypes and according to the growth regulator combinations present in the medium. The combination of BAP and TDZ showed a synergistic effect on shoot multiplication. The highest number of shoots per meristem (68 ± 2) was recorded More >

Peláez¹ DV, HD Giorgetti², OA Montenegro², OR Elia³, GD Rodríguez², RM Bóo^1,*, MD Mayor^4,*,*, CA Busso³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 169-176, 2010, DOI:10.32604/phyton.2010.79.169

Abstract Fire is a major ecological process within most terrestrial ecosystems. Therefore, understanding the vegetation response to fire is essential to its management. Our objective was to study the effect of a controlled fire, conducted at the end of summer season, on cover and density of the most common woody and herbaceous species in Phytogeographical Province of the Monte, Argentina. In general, after the control fire, the woody species mean percentage cover was significantly lower (p<0.05) in the fire treatment than in the control (no controlled fire). This effect was persistent during the study period. No… More >

Feng¹ RJ, LF Lu², KH Yuan³, P Cheng³, LL Zhang³, JF Qi³, Y Ren⁴, XL Xu⁵, XB Zhang³, LY Zhou³, YD Zhang³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 163-168, 2010, DOI:10.32604/phyton.2010.79.163

Abstract A banana (Musa AAA, Cavendish subgroup cv. Brazil) cDNA encoding a putative rubredoxin-like protein (MaRd1) was obtained from total RNA isolated from cold-treated banana leaves using rapid amplification of cDNA ends (RACE) technique. MaRd1 cDNA contained 597 nucleotides encoding 198 amino acids in the open reading frame. MaRd1 protein showed 56% amino acid identity with that of Pyrococcus furiosus rubredoxin (P24297). A chloroplast transit peptide and a transmembrane region were detected at the N-terminus and the C-terminus, respectively, of the deduced amino acid sequence of MaRd1 gene. Southern blotting revealed the occurrence of at least two copies of MaRd1 More >

Franchini¹ MC, LF Hernández², LI Lindström³

Phyton-International Journal of Experimental Botany, Vol.79, pp. 153-161, 2010, DOI:10.32604/phyton.2010.79.153

Abstract Wax in the sunflower (Helianthus annuus L.) pericarp is an important morphological feature that interferes with oil quality and varies with crop management and environmental conditions. We studied the effect of a moderate water deficit (MWD) generated from early to late anthesis on quantitative development of the cuticle, and qualitative and quantitative development of the cuticular waxes (CW) of the pericarp in two hybrids grown under field conditions. The experiment was repeated during two consecutive seasons (Exp-I and Exp-II). At harvest maturity (HM), plants grown under a MWD showed higher CW content (31 to 47%) and… More >

Cerna¹ E, Y Ochoa², R Mendoza¹, MH Badii³, G Gallegos¹, J Landeros¹

Phyton-International Journal of Experimental Botany, Vol.79, pp. 147-152, 2010, DOI:10.32604/phyton.2010.79.147

Abstract Protein assays were conducted on Tetranychus urticae Koch, as potential resistance detection tools to plaguicides. This is a phytophagous mite that feeds on a large variety of plants. Experiments were carried out using a pesticide susceptible and three field crop strains of T. urticae. Protein was measured by colorimetric assays, using Kit-II from Bio-Rad, with bovine serum albumin (BSA) as standard. Homogenates were prepared using 10, 30, 50, 100, 300, 500 and 800 mites, with 30 replicates each. Linearity was obtained for the standard curve of the different methods, and r² values ranged from 0.877 to 0.985. The More >

Tizón¹ FR, DV Peláez^1,2,3, OR Elía^1,2

Phyton-International Journal of Experimental Botany, Vol.79, pp. 141-146, 2010, DOI:10.32604/phyton.2010.79.141

Abstract Fire plays a fundamental role in the structure of vegetation communities in the Caldenal. However, this effect has decreased considerably since the introduction of domestic cattle, which reduces the amount of fine combustible material. Objectives of this study were (1) to analyze the diversity and composition of a typical vegetation community in the south of the Caldenal after exposure to different fire frequencies, and (2) to show the convenience of using controlled fire for reversing the processes of scrub formation to states with more diverse and productive grassland communities. Forty-five herbaceous and woody species were… More >