Screening
of tomato (Solanum
lycopersicum L.) genotypes for morphological and reproductive traits
across the different season
AK
Singh1, Umesh Singh2, RP Singh1, K Singh3,
MK Singh2, RK Singh2
1Department of
Botany, Udai Pratap Autonomous College,
Varanasi-221002
2Division of Crop Improvement,
Indian Institute of Vegetable Research, PB- 01, Varanasi- 221305
3Department of
Entomology, Udai Pratap Autonomous
College, Varanasi-221002
Received: 10 March 2016 Revised Accepted: 05 May 2016
ABSTRACT
A
radical decrease in tomato yield was recorded during the summer season in India
due to high temperature. In the present investigation, twenty three tomato
genotypes were screened under field condition during two consecutive seasons of
spring-summer (February to May) and autumn-winter (October to February). Early
flowering was observed in summer than winter season. Pollen viability decreased
greatly during summer season. Maximum viability of the pollen grains was
observed in EC-538156 (94.33 %), PS-1 (90.00 %) and Kashi Amrit (90.00 %) and
the minimum pollen grains were recorded in EC-362941 (72.00 %) during winter
season. Whereas, increment of pollen viability were noted during summer in
EC-538156 (94.67%), Hisar Lalit (Sel-18) (93.33%) and 15-SB (82.67%). Fruit set
percent at high temperature is stringently reliant on proper gametogenesis
(pollen and ovule development) and fertilization which is markedly decrease
at high temperature, Hisar Lalit showed less reduction (15.98%) in
fruit set (%) during summer than the other genotypes. In summer season Hisar
Lalit showed highest yield plant-1 1.39 kg and exhibited higher
degree of heat tolerance whereas, in winter season Pant T-3, EC-605696 and
Hisar Lalit (Sel-18) performed better in terms of yield.
Key Words:
Autumn-winter,
Polar diameter, Spring-summer season, Tomato