Showing papers on "Corchorus olitorius published in 1985"

Hydrogen peroxide metabolism as an index of water stress tolerance in jute

Abstract: Two species of jute plants Corchorus capsularis L. (cv. JRC 212) and C. olitorius L. (cv. JRO 632) were subjected to water stress for 2 and 4 days by withholding water. The relative water content (RWC) decreased in both plants under water stress but to a greater extent in C. olitorius. The C. olitorius seedlings also showed greater membrane injury than C. capsularis seedlings under water stress as was evident from injury index data. Water stress increased glycolate oxidase (EC 1.1.3.1.) activity more in C. olitorius than in C. capsularis. The activity of superoxide dismutase (SOD, EC 1.15.1.1.) and catalase (EC 1.11.1.6.) decreased under water stress and their decrease was higher in C. olitorius than in C capsularis. The level of hydrogen peroxide and lipid peroxidation also increased in both plants under water stress and the increase was higher in C. olitorius than in C. capsularis seedlings. Under comparable external water stress, C. capsularis seedlings showed lower membrane damage, lower H2O2 accumulation and lower lipid peroxidation than C. olilorius which may be taken as indicative of higher water stress tolerance capacity of the former.

Translocation and Distribution of 14C-labelled Assimilate associated with Growth of Jute (Corchorus olitorius L.)

Abstract: Assimilate translocation from different source leaves and the partitioning of whole plant photosynthates at different growth stages of jute (Corchorus olitorius L.) was studied in the field using I4CO,. The I4C assimilates from the terminal source leaves were translocated to the apical bud and to other developing leaves at the top of the plant while the middle leaves supplied only the adjacent stem sections. The lower leaves exported to the basal internodes and the roots. Removal of all the leaves excepting the six terminal ones reduced but did not stop apical growth, but checked the growth in stem diameter completely. The results are discussed in relation to what is known of the general pattern of jute growth by the apical meristem and the cambium. The I4C assimilated by the whole plant was translocated to and accumulated in the parts according to their mode of development. The carbon assimilated at 40 days from sowing was distributed mainly to the leaves, but at 62 days it was distributed almost equally to the leaves, wood and bark. The carbon assimilated at 105 days accumulated to the greatest extent in the wood. Distribution of assimilate to the bark, which produces the yield of jute, was best during the early stages, increased to a maximum during the second month but declined again at the later stages.

Morphotype diversity in Nigerian land-races of Corchorus olitorius

Abstract: SummaryField evaluation of Nigerian accessions of vegetable jute, Corchorus olitorius, at Ibadan showed considerable diversity. Leaf shape and days to flowering were the most clearly distinguished among the 13 characters observed. Plant branching varied within the same accession, and was greatly influenced by spacing and soil fertility. Eight weeks after planting, the plants were 30 cm tall, with variable fresh biomass containing c. 20% dry matter, and consisting of c. 34% edible fresh leaves. The difficulty of maintaining morphotype purity under rural cultivation during germplasm evaluation and its implication for breeding is discussed.