Studies on the Response of Silicon on Chlorophyll Fluorescence, Membrane Stability, Plant Water Status and Yield of Rice Genotypes under Drought | Chapter 10 | Cutting-edge Research in Agricultural Sciences Vol. 3

 

A field experiment was conducted at the Department of Rice, Tamil Nadu Agricultural University, Coimbatore, during the 2017 Kharif season to study the effect of silicon on membrane stability, plant water status and yield of rice genotypes under drought. Maximum membrane stability index (MSI) (93.1) was observed in CB06803 and minimum (86.2) was observed in CB08702 under control when drought-related Sahbhagidhan retained maximum MSI (79.8) with lower Malondialdehyde (MDA) content (0.68 μmol g-1) and lower MSI (67.6) with lower (MDA) content (1.75 μmol g-1) in IR64. Silicon foliar spray (Silixol 0.6 percent) under drought increased the MSI in Sahbhagidhan to maximum (88.4), wherein CB13805 was observed at minimum (78.7). In the aspect of plant water status, a greater decrease of 18 percent in RWC under drought, with lower the reduction in drought tolerant check Sahbhagidhan (14.5 percent ). Foliar spray of silicon (Silixol 0.6 percent ) under drought increased the RWC by 12 percent with The rise in genotype CB13805 (16.3 percent) was greater. However, higher osmotic potential adjustment was observed in genotype CB12702 (0.674) under drought, while foliar silicon spray (Silixol 0.6 percent) under drought reduced osmotic adjustment with a higher shift in genotype CB06803 followed by susceptible IR64 regulation. The chlorophyll fluorescence parameters were significantly increased by 11 percent, 6 percent, 6.7 percent and 7.7 percent in Fv / Fm, Y (II), ETR and qP over drought by foliar silicon spray (Silixol 0.6 percent) under drought. Non-Photochemical Quenching (NPQ) increased by 48% in drought, but silicon foliar spray (Silixol 0.6%) increased by 48% in drought. The drought has limited NPQ. With 30 percent under drought, a limited grain yield per plant was observed,  For genotype CB13804, a reduction (1.9 percent) was observed. Silicon (Silixol 0.6 percent) foliar spray below Drought increased by 23% with a higher increase (43%) in genotype CB12702 per plant yield. The silicon foliar spray (Silixol 0.6 percent) under drought improved the foliar spray under drought, regardless of the genotypes.  In the genotypes above, membrane stability and plant water status indicate its significance for  Reducing the effects of drought and improving the rice mechanism for drought tolerance. The aggregate outcome  The study showed that drought has a dramatic effect on the rice reproductive level, which is Relieved by the application of silicon, which increases membrane stability, plant water Attributes of rank and yield. A drought tolerant search performed better on drought by Sahbhagi Dhan State and everything in foliar application under drought of silicon as well. CB12702, CB06803 genotypes and Even in the absence of silicon use, CB13804 showed better performance in drought, while with These two CB13805 genotypes also demonstrate better performance with silicon foliar spray underneath. Drought may be due to changes in the various physiological and metabolic pathways through the silicon presence.

Author (s) Details

N. Gokulraj
Department of Crop Physiology, Tamilnadu Agricultural University, Coimbatore-641003, India.

Dr. N. V. Ravichandran,
Department of Crop Physiology, Tamilnadu Agricultural University, Coimbatore-641003, India.


P. Boominathan
Department of Crop Physiology, Tamilnadu Agricultural University, Coimbatore-641003, India
R. P. Soundararajan
Department of Rice, Tamilnadu Agricultural University, Coimbatore-641003, India.

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Describing the Genotypic Variation in Yield in Wheat to Cold Sensitive Response at High Altitude | Chapter 4 | Cutting-edge Research in Agricultural Sciences Vol.2

 Agriculture is one of the major sources of income and gainful employment for the people of

Uttarakhand state in India. Wheat based agriculture system contributes immensely to maintain
livelihood for a large section of people inhabited in hills of this state because of short growing season
in summer. Hill is considered as backward (i.e., not progressive) region since introduction of improved
varieties of seeds and transfer of advance agriculture technology cast little or no impact on promotion
and development of agriculture in this sector. Diversity in productive capacity of crop experience on
same site at different elevation of hill because constraints imposed by ecology did not permit such
movement to any unlimited extent. Low temperature becomes an important limitation for production of
grains in wheat cultivars as altitude increases. An alteration of growth habit accompanied with
changes in morphology of leaf, shoot and root characteristic and cool temperature induced sterility in
florets seemed to be associated with yield loss. In this investigation, as an initial approach possible
limits of some physiology related deterrent yield contributing traits are identified through study the
extent of variability of these characters, their relationship and relative contribution to grain yield
among 9 wheat cultivars (viz., HPW 155, HPW 236, HPW 277, HS 473, SKW 323, Sonalika, VL 829,
VL 832 and Local cultivar) grown under field condition at an elevation of 2100 m above mean sea
level (msl) at Ranichauri (78°24/N and 30°18/E). The results revealed an increase in average growing
degree days for head emergence and number of days experiencing lower soil temperature than air
temperature during anthesis together induced sterility in florets. An increase in thermal time at post
anthesis grain filling period encouraged the production of grains. Grain yield did not show significant
correlation with leaf, shoot and root characters. Susceptible cultivars, however, exhibited a greater
percentage of sterile florets in population, low grain yield, high root to shoot ratio, less thickness of
fresh leaves and less dry matter deposition. The varieties VL 829, HPW 236 and HS 473 showed
superior in yield and higher tolerance to cool conditions at high altitude.

Author(s) Details

B. B. Bandyopadhyay
G. B. Pant University of Agriculture and Technology, Pantnagar-263 145, US Nagar, Uttarakhand, India.

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