Volume 81, Issue 4
April 1975, pages 145-185
pp 145-149 April 1975
pp 150-153 April 1975
pp 154-161 April 1975
One new species,viz., Simulium (Simulium) singtamense and two apparently new but unnamed species of the nominate subgenus are described and illustrated, thus bringing the number of species from seven to ten in the Darjeeling area of India. A key to the species is appended herewith.
pp 162-169 April 1975
This is an account of the morphology, cytoembryology, structure of fruit and seed ofAsparagus virgatus Baker, which is an exotic species seldom described in Indian floras. The plants are perennial, unarmed herbs with erect shoots and ascending cladodes. Twenty to thirty adventitious cylindrical roots arise from the underground perennial rhizome. The flowers are bisexual. The stigma is capitate. Fruit-setting is rare. The development of female gametophyte conforms to the eight-nucleatePolygonum-type. About 32% of the pollen is sterile. The haploid number of chromosomes is twenty (n=20), being recorded in this species for the first time. The same number occurs inA. tenuifolius and in a local variety ofA. racemosus. The basic number for the genus is supposed to be five, many species havingn=10 chromosomes.
pp 170-173 April 1975
Turmeric leaves infected byColletotrichum capsici exhibit a higher respiratory rate with augmentation of the terminal oxidative system. A similar effect is brought about by the treatment of the turmeric leaves with toxins isolated from culture filtrate and mycelium of the pathogen. Ascorbic acid oxidase and polyphenol oxidase activity register the maximum increase both under infection and toxin treatment.
pp 174-180 April 1975
Sclereids have been described in the floral organs ofStrychnos samba Duvign.,Anthocleista schweinfurthii Gilg.,A. vogelii Planch.,Nuxia congesta R. Br. andDesfontainia spinosa Ruiz et Pav. of the 33 taxa of Loganiaceae examined. In this paper distribution, structure and ontogeny have been described. The importance of floral sclereids in the taxonomic evaluation of the family Loganiaceae has been pointed out.
pp 181-185 April 1975
Mutations induced by gamma rays, ethyl methane sulphonate and diethyl sulphate in Okra (Abelmoschus esculentus) variety Pusa Sawani are reported. In M2 generation variance increased at the lower doses, but considerably decreased at high doses. The increased variability is mainly due to micromutation. More variability is released in treatments of EMS and DES than gamma rays.