Volume 36, Issue 2
August 1952, pages 43-97
pp 43-53 August 1952
pp 54-58 August 1952
Wilt symptoms in cotton and red gram caused by the soil-borne pathogensF. vasinfectum andF. udum as seen by the naked eye and clearly made out by photographing with tricolour red filter on panchromatic film are recorded.
Wilt symptoms in cotton when sown inF. vasinfectum infected soils appear on the seventh day in variety M. 9 and thirteenth day in variety K. 2 after germination of the seeds as very distinct vein clearing discernible to the eye in cotyledonary leaves. Later, the first leaves also show vein clearing not clear to the eye but detectable by photographing with tricolour red filter.
Wilt symptoms in red gram byF. udum do not culminate in vein clearing as in cotton although there is a general and well-marked dechlorophyllation presenting almost a toxemic condition. This is first seen on the eighteenth day after germination.
The possibility of these vascular wilts interfering with the normal uptake of some of the essential chlorophyll forming heavy metals is discussed.
pp 59-69 August 1952
External morphology and vascular anatomy of the flowers ofCarica papaya have been described and the results analysed.
The general occurrence of partial gamopetaly in staminate and hermaphrodite flowers ofCarica has been compared with the similar condition in the Cucurbitaceæ and Passifloraceæ.
Some morphological and anatomical differences in the staminate flowers from diœcious and monœcious plants have been noted and it has been tentatively suggested that inCarica diœcism is more specialized and reduced than monœcism.
The vascular supply of sepals is believed to have undergone reduction corresponding to external form.
The vascular supply of the placenta is interesting in so far as it is furnished partly by marginal bundles and partly by secondary marginal strands. This has been made the basis for the suggestion that superficial placentation inCarica has been derived from axile placentation.
The comparative morphology and vascular anatomy, specially of gynæceum ofC. papaya seems to justify the position of the Caricaceæ near the Passifloraceæ and Cucurbitaceæ.
pp 70-80 August 1952
Amylose and amylopectin fractions have been isolated from rice by a slight modification of the butanol fractionation method of Schoch. This method has been found to give good yields.
The amylose and the amylopectin ratios of the different varieties of rice have been estimated by the potentiometric titration of starch solutions with iodine.
The cooking quality of the different varieties of rice has been determined by employing the “Swelling Number” method of B. S. Rao.
It has been found that with an increase in the amylose content, the swelling number of rice increases.
No change in the amylose content takes place, when rice is parboiled though there is a marked fall in the Swelling Number. Other ways of curing rice do not also affect the amylose content.
pp 81-84 August 1952
pp 85-95 August 1952
pp 97-97 August 1952 Erratum