Effects of drought on N absorption and utilization in winter wheat at different developmental stages

doi:10.3773/j.issn.1005-264x.2010.05.009

Abstract

Abstract:

Aims Our objective was to investigate the effects of different water stress levels on yield, N absorption, allocation and utilization in winter wheat cultivars ‘Shijiazhuang 8’ (drought resistant) and ‘Yanmai 20’ (drought sensitive) during different growth durations.

Methods We divided the growing stages of winter wheat into recovering-jointing, jointing-flowering and late filling. Soil water levels based on field capacity were 75%-80% (control, full water supply or well-watered), 65%-70% (light drought stress), 55%-60% (medium drought stress) and 40%-45% (severe drought stress) from winter wheat seeding to maturity and were controlled by irrigation and mobile rain shelters.

Important findings The drought resistant cultivar ‘Shijiazhuang 8’ had a higher grain yield than ‘Yanmai 20’ under drought stress, and medium drought stress in all the three durations can increase winter wheat yield. Drought stress in the jointing-flowering stage has the greatest effects on N assimilation and translocation in winter wheat, the second greatest being in the recovering-jointing stage, while that in late filling stage has few effects. Both medium and severe drought stress during different growth durations will lower the translocation of stored nitrogen before anthesis into grain, as well as N utilization rate and productivity; on the other hand, light drought stress in the recovering-jointing and late filling stages can improve the translocation of stored N into grain as well as N utilization rate and productivity. Under drought stress, N accumulation in grain of drought-resistant ‘Shijia- zhuang 8’ relies more on the retranslocation of stored N before anthesis, while that of ‘Yanmai 20’ relies more on the N accumulation and translocation after anthesis. Considering yield and N translocation of wheat, light drought stress during the recovering-jointing and late filling stages is necessary, as well as sufficient irrigation during jointing-flowering stage, so as to improve N accumulation and partitioning.

Key words: different growth durations, N absorption, utilization, water stress, winter wheat

LIU En-Ke, MEI Xu-Rong, GONG Dao-Zhi, YAN Chang-Rong, ZHUANG Yan. Effects of drought on N absorption and utilization in winter wheat at different developmental stages[J]. Chin J Plant Ecol, 2010, 34(5): 555-562.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2010.05.009

https://www.plant-ecology.com/EN/Y2010/V34/I5/555

Figures/Tables 6

References 22

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处理 Treatment	‘偃麦20’ ‘Yanmai 20’	‘石家庄8号’ ‘Shijiazhuang 8’
T1	5 375^d	6 100^e
T2	6 725^c	7 150^c
T3	7 675^a	8 250^b
T4	6 475^c	7 275^cd
T5	6 725^c	7 550^c
T6	7 125^b	8 200^b
T7	6 500^c	7 100^c
T8	6 550^c	7 575^c
T9	7 425^a	8 450^a
T10	7 450^a	8 150^b

处理 Treatment	‘偃麦20’ ‘Yanmai 20’	‘石家庄8号’ ‘Shijiazhuang 8’
T1	5 375^d	6 100^e
T2	6 725^c	7 150^c
T3	7 675^a	8 250^b
T4	6 475^c	7 275^cd
T5	6 725^c	7 550^c
T6	7 125^b	8 200^b
T7	6 500^c	7 100^c
T8	6 550^c	7 575^c
T9	7 425^a	8 450^a
T10	7 450^a	8 150^b

品种 Cultivar	处理 Treatment	籽粒 Grain	叶 Leaf	茎鞘+颖壳+穗轴 Stem, spike and glume
‘偃麦20’ ‘Yanmai 20’	T1	23.7^c	10.7^a	4.8^b
	T2	23.8^c	9.9^ab	4.6^bc
	T3	23.6^c	10.7^a	4.3^c
	T4	19.2^d	9.4^b	4.7^b
	T5	22.6^c	9.2^b	4.9^b
	T6	23.1^c	8.4^c	4.1^c
	T7	27.7^b	6.8^c	4.8^b
	T8	29.6^a	7.9^c	5.6^a
	T9	28.1^b	7.6^cd	5.1^b
	T10	28.2^b	8.0^c	4.0^c
‘石家庄 8号’ ‘Shijiazhuang 8’	T1	21.6^c	10.3^a	5.8^a
	T2	20.0^d	9.9^a	3.9^c
	T3	20.4^cd	10.1^a	4.9^b
	T4	18.3^e	7.8^b	5.2^ab
	T5	18.8^e	8.2^b	4.4^b
	T6	19.8^d	8.5^b	4.6^b
	T7	22.6^b	8.5^b	4.3^b
	T8	23.6^b	8.7^b	4.8^b
	T9	24.7^a	8.3^b	4.5^b
	T10	24.1^ab	8.2^b	4.4^b

品种 Cultivar	处理 Treatment	籽粒 Grain	叶 Leaf	茎鞘+颖壳+穗轴 Stem, spike and glume
‘偃麦20’ ‘Yanmai 20’	T1	23.7^c	10.7^a	4.8^b
	T2	23.8^c	9.9^ab	4.6^bc
	T3	23.6^c	10.7^a	4.3^c
	T4	19.2^d	9.4^b	4.7^b
	T5	22.6^c	9.2^b	4.9^b
	T6	23.1^c	8.4^c	4.1^c
	T7	27.7^b	6.8^c	4.8^b
	T8	29.6^a	7.9^c	5.6^a
	T9	28.1^b	7.6^cd	5.1^b
	T10	28.2^b	8.0^c	4.0^c
‘石家庄 8号’ ‘Shijiazhuang 8’	T1	21.6^c	10.3^a	5.8^a
	T2	20.0^d	9.9^a	3.9^c
	T3	20.4^cd	10.1^a	4.9^b
	T4	18.3^e	7.8^b	5.2^ab
	T5	18.8^e	8.2^b	4.4^b
	T6	19.8^d	8.5^b	4.6^b
	T7	22.6^b	8.5^b	4.3^b
	T8	23.6^b	8.7^b	4.8^b
	T9	24.7^a	8.3^b	4.5^b
	T10	24.1^ab	8.2^b	4.4^b

品种 Cultivar	处理 Treatment	籽粒 Grain		叶片 Leaf		茎鞘+颖壳+穗轴 Stem, spike and glume		总积累量 Total accumulation amount (kg?hm^-2)
品种 Cultivar	处理 Treatment	积累量 Accumulation amount (kg?hm^-2)	比例 Proportion (%)	积累量 Accumulation amount (kg?hm^-2)	比例 Proportion (%)	积累量 Accumulation amount (kg?hm^-2)	比例 Proportion (%)	总积累量 Total accumulation amount (kg?hm^-2)
‘偃麦20’ ‘Yanmai 20’	T1	127.2^e	81.1	10.2^d	6.5	19.4^e	12.4	156.8
	T2	160.4^c	81.8	11.2^d	5.7	24.4^d	12.5	196.0
	T3	181.0^c	82.7	16.1^b	7.3	21.8^e	9.9	218.9
	T4	124.4^e	76.8	10.8^d	6.7	26.8^d	16.5	161.9
	T5	151.8^d	79.5	11.0^d	5.8	28.2^d	14.8	191.0
	T6	164.3^d	83.6	10.1^d	5.2	22.1	11.2	196.4
	T7	179.8^c	78.2	13.2^d	5.7	37.0^b	16.1	230.0
	T8	194.0^b	76.6	14.6^cd	5.8	44.6^a	17.6	253.2
	T9	208.6^a	78.2	20.1^a	7.5	38.2^b	14.3	266.8
	T10	210.2^a	82.1	15.8^b	6.2	30.0^c	11.7	256.0
‘石家庄8号’ ‘Shijianzhuang 8’	T1	131.6^e	76.6	8.9^d	5.2	31.3^c	18.2	171.8
	T2	143.0^e	79.4	11.7^c	6.5	25.4^d	14.1	180.1
	T3	168.1^d	78.6	12.0^c	5.6	33.8^b	15.8	213.8
	T4	133.0^e	80.0	6.9^e	4.1	26.3^d	15.8	166.2
	T5	141.9^e	81.5	8.1^d	4.7	24.0^d	13.8	174.0
	T6	162.0^d	81.8	9.5^d	4.8	26.5^d	13.4	198.1
	T7	160.4^d	76.1	15.5^a	7.3	34.8^a	16.5	210.7
	T8	178.7^c	77.7	15.5^a	6.7	35.7^a	15.5	229.9
	T9	208.5^a	80.7	14.6^a	5.6	35.4^a	13.7	258.5
	T10	196.1^b	81.7	13.8^b	5.7	30.2^c	12.6	240.0