Effects of Boron Nutrition and Water Stress on Nitrogen Fixation, Seed δ15N and δ13C Dynamics, and Seed Composition in Soybean Cultivars Differing in Maturities
Table 3
Effects of water stress on seed protein, oil, and fatty acids (g kg−1) in maturity group (MG) III (Williams 82 and Pella 86) and MG V (Hutcheson and Freedom) soybean cultivars. Plants were grown under well-watered and water-stressed conditions and boron was foliar applied at 0.45 kg⋅ha−1 at flowering and seed-fill stages.
Genotype
Well-watered plants (soil water potential = −15 to −20 kPa)
B treatment
Protein
Oil
Palmitic (C16:0)
Stearic (C18:0)
Oleic (C18:1)
Linoleic (C18:2)
Linolenic (C18:3)
Williams 82 (MG III)
−B
404 e
222 a
112 a
32.3 a
255 a
523 b
67.4 d
+B
412 d
225 a
113 a
25.6 a
245 a
532 b
65.3 d
Pella 86 (MG III)
−B
417 d
216 b
114 a
24.4 a
243 a
542 b
65.7 d
+B
431 b
215 b
113 a
24.5 a
253 a
537 b
63.4 d
Hutcheson (MG V)
−B
423 c
201 c
124 a
31.4 a
202 b
597 a
86.7 b
+B
438 a
203 c
121 a
35.8 a
258 a
576 a
76.9 c
Freedom (MG V)
−B
435 b
205 c
113 a
32.3 a
217 b
586 a
97.2 a
+B
444 a
210 c
115 a
33.8 a
264 a
568 a
75.5 c
Genotype
Water-stressed plants (soil water potential = −90 to −100 kPa)
B treatment
Protein
Oil
Palmitic (C16:0)
Stearic (C18:0)
Oleic (C18:1)
Linoleic (C18:2)
Linolenic (C18:3)
Williams 82 (MG III)
−B
422 e
214 a
117 a
24.1 a
276 b
543 a
54.7 b
+B
436 d
215 a
124 a
26.4 a
333 a
534 b
65.3 a
Pella 86 (MG III)
−B
436 d
197 b
116 a
25.6 a
286 b
526 b
61.5 ab
+B
441 c
201 b
122 a
32.3 a
325 a
536 b
67.7 a
Hutcheson (MG V)
−B
440 c
191 b
116 a
31.4 a
286 b
547 a
63.8 ab
+B
453 b
186 c
118 a
27.7 a
326 a
532 b
62.5 ab
Freedom (MG V)
−B
446 c
175 c
119 a
29.4 a
266 b
552 a
64.8 a
+B
469 a
18.5 c
117 a
31.7 a
336 a
547 a
57.4 b
Means within a column of each water treatment followed by the same letter are not significantly different at the 5% level as determined by Fishers’ LSD test. Values are means of four replicates.
