International Journal of Botany Studies

International Journal of Botany Studies


International Journal of Botany Studies
International Journal of Botany Studies
Vol. 7, Issue 3 (2022)

Germination, vigour and physiological responses of hybrid maize (Zea mays L.) to pre-sowing seed-hardening practices


Rex Immanuel R

Maize (Zea mays L.) serves a significant role in ensuring food and nutritional security and livelihoods of millions of resource-poor smallholders. In India, most of the traditional varieties are replaced with hybrids. However, hybrid maize productivity in the rainfed agro-ecosystems are vulnerable to various climate-induced abiotic stresses, especially drought, which often severely impact crop yield. Physiological pre-conditioning of the seed by hydration, known as seed hardening, is believed to withstand moisture stress under rainfed conditions. Hence, lab experiments were conducted at Department of Agronomy, Annamalai University, Annamalai Nagar, Tamil Nadu during Kharif 2018 to assess the effect of seed hardening treatments on germination, growth and physiological conditions of hybrid maize. Fourteen treatments viz., T1 – Absolute control, T2 – Distilled water soaked, T3 – Cycocel @ 250 ppm, T4 – Cycocel @ 500 ppm, T5 – CaCl2 @ 1%, T6 – CaCl2 @ 2%, T7 – KCl @ 1%, T8 – KCl @ 2%, T9 – KH2 PO4 @ 1%, T10 – KH2 PO4 @ 2%, T11 – ZnSO4 @100 ppm, T12 – ZnSO4 @ 200 ppm, T13 – MgSO4 @100 ppm and T14 – MgSO4 @ 200 ppm with three replications were given to hybrid maize seeds. Each seed-hardening treatment caused a significant variation in germination, seedling vigour and physiological responses. Among them CaCl2 treatment gave significantly favourable effect on seed germination (96.00 %), germination energy (94.67 %), time to reach 50 % germination (2.3 days), germination value (1.86), speed of germination (6.8 per day), mean emergence time (3.2 days), coefficient of velocity (167) and germination index (38.5), compared to the control. Likewise, the same treatment appreciably influenced the growth and physiological parameters such as shoot length (21.20 cm), root length (13.82 cm), collar thickness (7.67 mm), seedling fresh weight (4.22 g), seedling dry weight (0.46 g), R/S (length) ratio (0.65), R/S (dry weight) ratio (0.74), moisture content (89.10 %), RWC (95.92 %), seedling vigour (Length) index (3360) and seedling vigour(Mass) index (44.16). Thus, CaCl2 at two per cent concentration may used to seed hardening of hybrid maize.
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How to cite this article:
Rex Immanuel R. Germination, vigour and physiological responses of hybrid maize (Zea mays L.) to pre-sowing seed-hardening practices. International Journal of Botany Studies, Volume 7, Issue 3, 2022, Pages 14-20
International Journal of Botany Studies International Journal of Botany Studies