The Relationship between Anthracnose Severity and Populations of Bacteria on the Phylloplane of the Tropical Pasture Legume Stylosanthes Scabra

1995 ◽  
Vol 5 (1) ◽  
pp. 39-46 ◽  
Author(s):  
S.D. Hetherington ◽  
S. Chakraborty ◽  
M. Thomas ◽  
J.A.G. Irwin
Keyword(s):  
Tropical Pasture ◽  
Stylosanthes Scabra ◽  
The Relationship ◽  
Pasture Legume

Using Lindenmayer systems to model morphogenesis in a tropical pasture legume Stylosanthes scabra

1999 ◽  
Vol 77 (3) ◽  
pp. 394-403 ◽  
Author(s):  
Peter A. Wilson ◽  
James S. Hanan ◽  
Peter M. Room ◽  
Sukumar Chakraborty ◽  
David Doley
Keyword(s):  
Tropical Pasture ◽  
Lindenmayer Systems ◽  
Stylosanthes Scabra ◽  
Pasture Legume

Interaction between Helicoverpa armigera and Colletotrichum gloeosporioides on the tropical pasture legume Stylosanthes scabra

2000 ◽  
Vol 51 (1) ◽  
pp. 107 ◽  
Author(s):  
Peter A. Wilson ◽  
Peter M. Room ◽  
Myron P. Zalucki ◽  
Sukumar Chakraborty
Keyword(s):  
Host Plant ◽  
Adult Female ◽  
Helicoverpa Armigera ◽  
Colletotrichum Gloeosporioides ◽  
Life Stages ◽  
Tropical Pasture ◽  
Helicoverpa Armígera ◽  
Stylosanthes Scabra ◽  
Lepidoptera Noctuidae ◽  
Pasture Legume

Glasshouse experiments determined effects of a moth, Helicoverpa armigera (Lepidoptera: Noctuidae), and the anthracnose pathogen, Colletotrichum gloeosporioides (Penz.) Penz. and Sacc., on each other when attacking the same host plant, Stylosanthes scabra (Vog.) (Leguminosae) cv. Fitzroy. The host was treated with both organisms in 2 ways of succession and at 2 different life stages each. Larvae of the moth preferred to feed on healthy plants rather than plants recently infected with C. gloeosporioides, and preferred such newly infected plants to severely diseased ones. Adult female moths laid more eggs on healthy and recently infected plants than on diseased plants, when given a choice of all 3 plant types. Severity of anthracnose disease was neither promoted nor retarded by damage to leaves caused by larvae of the moth.

Using Lindenmayer systems to model morphogenesis in a tropical pasture legume Stylosanthes scabra

1999 ◽  
Vol 77 (3) ◽  
pp. 394-403 ◽  
Author(s):  
Peter A Wilson ◽  
James S Hanan ◽  
Peter M Room ◽  
Sukumar Chakraborty ◽  
David Doley
Keyword(s):  
Morphological Data ◽  
Growth Data ◽  
Lindenmayer Systems ◽  
Virtual Plant ◽  
Total Leaf ◽  
Systems Modelling ◽  
Plant Form ◽  
Pasture Plant ◽  
Stylosanthes Scabra ◽  
Pasture Legume

This paper summarizes the processes involved in designing a mathematical model of a growing pasture plant, Stylosanthes scabra Vog. cv. Fitzroy. The model is based on the mathematical formalism of Lindenmayer systems and yields realistic computer-generated images of progressive plant geometry through time. The processes involved in attaining growth data, retrieving useful growth rules, and constructing a "virtual plant" model are outlined. Progressive output morphological data proved useful for predicting total leaf area and allowed for easier quantification of plant canopy size in terms of biomass and total leaf area.Key words: Lindenmayer systems, modelling, Stylosanthes, morphogenesis, plant form.

Inheritance of anthracnose resistance in the tropical pasture legume Stylosanthes hamata

1995 ◽  
Vol 46 (7) ◽  
pp. 1353 ◽  
Author(s):  
N Iamsupasit ◽  
DF Cameron ◽  
M Cooper ◽  
S Chakraborty ◽  
LA Edye
Keyword(s):  
Combining Ability ◽  
Colletotrichum Gloeosporioides ◽  
Single Gene ◽  
General Combining Ability ◽  
Tropical Pasture ◽  
Gene Model ◽  
Stylosanthes Hamata ◽  
Moderately Resistant ◽  
Half Diallel ◽  
Pasture Legume

Eight tetraploid accessions of the tropical pasture legume Stylosanthes hamata with varying levels of response to the anthracnose pathogen (Colletotrichum gloeosporioides) were crossed in a half diallel scheme. Based on mean disease severity ratings (MDR), two parents, 55830 and 75164, were grouped as resistant (R), 55828 and 65365 were susceptible (S), and the remaining four, cvv. Verano and Amiga and 65371 and 75162 were moderately resistant (MR). Of these, the two resistant parents appear to carry different genes for resistance. The MDR of 20 of the 28 F2 populations was significantly different from their mid-parent MDR and the expression of resistance, in most cases, was recessive. Only a limited number of the F2 distributions for crosses between RxS, RxMR and MRxS parents conformed to a single gene model. The inheritance patterns observed were considered to be predominantly quantitative. Variation for general combining ability, was as large as or larger than that for specific combining ability suggesting that a large proportion of the genetic differences among the parents was additive. The finding that the resistance is inherited as a quantitative trait is consistent with results on the epidemiology of anthracnose in tetraploid S. hamata.

Salt tolerance of some tropical pasture legumes with potential adaptation to cracking clay soils.

1986 ◽  
Vol 26 (2) ◽  
pp. 181 ◽  
Author(s):  
BA Keating ◽  
RW Strickland ◽  
MJ Fisher
Keyword(s):  
Salt Tolerance ◽  
Maximum Growth ◽  
Clay Soils ◽  
Tropical Pasture ◽  
Pasture Legumes ◽  
Eastern Australia ◽  
North Eastern ◽  
Electrical Conductivities ◽  
Macroptilium Lathyroides ◽  
Stylosanthes Scabra

Cracking clay soils or vertisols occur in large areas of the subhumid regions of north-eastern Australia and frequently contain appreciable levels of salt in their subsoils. The comparative salt tolerance of some tropical pasture legumes was studied in pots with NaCl added to a clay soil to achieve electrical conductivities (saturated extract, ECe) over the range 2.0- 20.0 dS m-1. Tolerance, based on EC, at 50% of maximum growth (in parentheses) was in the order: Macroptilium atropurpureum cv. Siratro (10.6)> Macroptilium lathyroides cv. Murray (9.9) > Vigna trilobata (9.7) > Indigofera spicata (9.5) > Desmanthus subulatus (9.3) > Arachis pintoi (7.9) > Clitoria ternatea (6.4) > Stylosanthes scabra (5.6) > Indigofera schimperi (5.4) > Psoralea tenax (5.3) > Rhynchosia minima (5.1). The grass Panicum coloratum cv. Bambatsi was markedly more tolerant than any of the legumes studied, with 50% yield at an EC, of 16.4 dS m-1. Patterns of Na+ and Cl- uptake with increasing level of salt differed between species, but were not related to the degree oftolerance observed. The results are discussed in terms of the reported salinity tolerance of legumes generally and their implications to the search for persistent legumes for clay soils.

Polysaccharides of tropical pasture herbage. III. The distribution of the major polysaccharide components of Townsville lucerne (Stylosanthes humilis) during growth

1971 ◽  
Vol 24 (5) ◽  
pp. 1041 ◽  
Author(s):  
CP Way ◽  
GN Richards
Keyword(s):  
Gas Chromatography ◽  
Medicago Sativa ◽  
Monosaccharide Composition ◽  
Tropical Pasture ◽  
Stages Of Growth ◽  
Pasture Legumes ◽  
Pectic Substances ◽  
Stylosanthes Humilis ◽  
Stem Leaf ◽  
Pasture Legume

Stylosanthes humilis, the predominant pasture legume in North Queensland, has been collected at three different stages of growth, viz. flowering, seeded, and senescence. The plants have been divided into stem, leaf, root, seed, and pod and each fraction has been analysed for the following types of polysaccharide components: water- solubles, pectic substances, hemicelluloses, and cellulose. The absolute monosaccharide composition of each of these fractions has been determined by hydrolysis and gas chromatography. Most of the polysaccharide components are similar in nature to those previously found in temperate pasture legumes (e.g. Medicago sativa), but the seeds are unusual among legumes in containing no galactomannan and there is evidence of the presence of a glucomannan in all parts of the plant.

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