Volume 60, Issue 6
December 1964, pages 361-423
pp 361-366 December 1964
pp 367-370 December 1964
pp 371-379 December 1964
The shy-bearing tendency of Sweet lime trees has been observed due to low percentage of perfect flowers and not due to self-incompatibility as reported by some workers. The results of present studies, to induce a higher percentage of perfect flowers have shown that average fruit-set could be increased to 1·39 per cent by bending and ringing the branches and to 2·80 per cent by spraying with IBA 100 ppm, as against 1·09 per cent fruit-set in the control.
pp 380-393 December 1964
The fruits ofArtocarpus heterophyllus (jack-fruit),A. altilis (bread-fruit) andA. lakoocha (barhal), etc., have been studied and described.
The whole female inflorescence increases and develops into a composite or multiple type of fruit. The so-called fruit has three regions: (i) The fruit axis, (ii) The persistent perianth and (iii) The true fruit.
The perianth is the most important part and constitutes the major bulk of the fruit. It has basically three regions (A. heterophyllus): (a) The lower free and fleshy edible region, (b) The middle fused region and (c) The upper free and horny non-edible region. InA. altilis, the fusion region extends upto the base but inA. lakoocha it goes up to the top and this (fusion region) becomes edible.
The true fruit developed from the carpel (ovary) is insignificant and may be considered as similar to one-seeded ‘achene’.
pp 394-398 December 1964
Naturally occurring chromosome breaks during metaphase I of meiosis inAloe barbadensis Mill. have been reported. The probable cause leading to these has been discussed. It is believed that the origin may be due to some physiological disturbances in cellular metabolism caused by environmental changes.
pp 399-413 December 1964
pp 414-423 December 1964
The morphology and anatomy ofTectaria cicutaria (L.) Copel. has been studied in detail. It shows structural and developmental similarities withTectaria amplifolia (Rao and Khare, 1964) already studied. Some resemblances are also recognisable with allied generaPeranema andDiacalpe (Davie, 1912).Tectaria was earlier placed under Polypodiaceae, but the morphological and anatomical features brought out from the present study ofT. cicutaria show that likeT. amplifolia also, it should be placed under Aspidiaceae, as has been rightly done by Copeland (1947).