Studies on the Response of Silicon on Chlorophyll Fluorescence, Membrane Stability, Plant Water Status and Yield of Rice Genotypes under Drought

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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