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Table 4 Effects of L2-4 strain inoculation on flower sex ratio and seed yield parameters of Jatropha

From: Leaf-residing Methylobacterium species fix nitrogen and promote biomass and seed production in Jatropha curcas

Treatment Number of female flowers per inflorescencea Number of male flowers per inflorescencea Ratio female:male flower Number of fruitsb Number of seedsb Seed weight (g)b per seed weight (mg)*
Trail I
 Control 1.68 ± 0.14 25.2 ± 1.83 1:15 4.75 ± 0.71 13.5 ± 2.13 6.86 ± 0.91 426.5 ± 41.8
 L2-4 4.48 ± 0.62 39.2 ± 4.19 1:9 16.6 ± 1.19 42.3 ± 4.27 22.1 ± 2.04 478.7 ± 20.7
 LSD (P ≤ 0.05) 0.75 4.08   1.13 4.12 1.93  
Trail II
 Control 3.5 ± 0.07 55.0 ± 2.08 1:16 10.7 ± 1.15 28.6 ± 3.78 13.6 ± 0.51 424.1 ± 25.2
 L2-4 9.28 ± 0.19 72.3 ± 1.99 1:8 18.4 ± 1.98 52.7 ± 4.72 26.7 ± 0.84 472.0 ± 13.0
 LSD (P ≤ 0.05) 1.92 8.18   1.50 3.57 2.39  
  1. Seedlings were inoculated by foliar spraying at 21 days after seed germination. A second spraying was made at the flowering stage. Plants were planted in large pots (n = 8 in Trial I and n = 12 in Trial II) and maintained in the open air
  2. Values are mean ± standard deviation (SD). Sterilized and non-sterilized garden soil was used in Trail I and II, respectively
  3. aData were recorded with 25 and 50 inflorescences at different time points for Trail I and II, respectively
  4. bNumber of fruits/plant, number of seeds/plant and seed weight/plant were recorded on 480 and 540 DAI from Trail I and II, respectively
  5. * Student’s t test showed that trees treated with L2-4 had significantly higher seed sets and seed yield per plant than non-treated controls (P < 0.05)