Drought resistance, water-use efficiency, and yield potential—are they compatible, dissonant, or mutually exclusive?

CSIRO Publishing - Tập 56 Số 11 - Trang 1159 - 2005
A. Blum

Tóm tắt

This presentation is a concept review paper dealing with a central dilemma in understanding, designing, and acting upon crop plant improvement programs for drought conditions. The association among yield potential (YP), drought resistance (DR), and water-use efficiency (WUE) is often misunderstood, which in turn can lead to conceptual oversight and wrong decisions in implementing breeding programs for drought-prone environments. Although high YP is the target of most crop breeding programs, it might not be compatible with superior DR. On the other hand, high YP can contribute to yield in moderate stress environments. Plant production in water-limited environments is very often affected by constitutive plant traits that allow maintenance of a high plant water status (dehydration avoidance). Osmotic adjustment (OA) is a major cellular stress adaptive response in certain crop plants that enhances dehydration avoidance and supports yield under stress. Despite past voiced speculations, there is no proof that OA entails a cost in terms of reduced YP. WUE for yield is often equated in a simplistic manner with DR. The large accumulation of knowledge on crop WUE as derived from research on carbon isotope discrimination allows some conclusions on the relations between WUE on the one hand, and DR and YP on the other, to be made. Briefly, apparent genotypic variations in WUE are normally expressed mainly due to variations in water use (WU; the denominator). Reduced WU, which is reflected in higher WUE, is generally achieved by plant traits and environmental responses that reduce YP. Improved WUE on the basis of reduced WU is expressed in improved yield under water-limited conditions only when there is need to balance crop water use against a limited and known soil moisture reserve. However, under most dryland situations where crops depend on unpredictable seasonal rainfall, the maximisation of soil moisture use is a crucial component of drought resistance (avoidance), which is generally expressed in lower WUE. It is concluded that the effect of a single ‘drought adaptive’ gene on crop performance in water-limited environments can be assessed only when the whole system is considered in terms of YP, DR, and WUE.

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Tài liệu tham khảo

10.1016/S0378-4290(99)00003-9

Amani, 1996, Journal Agronomy and Crop Science, 176, 119, 10.1111/j.1439-037X.1996.tb00454.x

10.1023/A:1026231904221

10.1023/A:1004317523264

10.1023/A:1018303922482

10.1016/0378-4290(84)90019-4

10.1016/S0378-4290(96)03462-4

10.1023/A:1004083305905

Blum, 1988, Journal of Experimental Botany, 39, 106, 10.1093/jxb/39.1.106

Blum, 1976, Agronomy Journal, 68, 111, 10.2134/agronj1976.00021962006800010029x

10.1071/AR9900799

10.1016/0378-4290(83)90047-3

10.1016/0378-4290(84)90060-1

Blum, 1995, Plant, Cell and Environment, 18, 77, 10.1111/j.1365-3040.1995.tb00546.x

Blum, 1994, Australian Journal of Agricultural Research, 45, 771

10.1016/S0378-4290(99)00064-7

Borrell, 2000, Crop Science, 40, 1295, 10.2135/cropsci2000.4051295x

10.1007/BF00023074

10.1016/j.plantsci.2003.11.023

10.1093/aob/mcf105

10.1016/S0378-4290(02)00029-1

Condon, 2002, Crop Science, 42, 122, 10.2135/cropsci2002.1220

10.1071/AR9791001

10.1023/A:1018322502271

Gavuzzi, 1997, Canadian Journal of Plant Science, 77, 523, 10.4141/P96-130

10.1016/S0378-4290(99)00002-7

10.1046/j.1365-3040.2002.00779.x

Hossain, 1990, Crop Science, 30, 622, 10.2135/cropsci1990.0011183X003000030030x

Johnson, 1984, Crop Science, 24, 957, 10.2135/cropsci1984.0011183X002400050032x

10.1023/A:1024620413781

Khanna-Chopra, 1988, Annals of Botany, 61, 649, 10.1093/aob/61.6.649

Kobata, 1996, Nihon Sakumotsu Gakkai Kiji, 65, 652

Lilley, 1996, Journal of Experimental Botany, 47, 1427, 10.1093/jxb/47.9.1427

10.1016/0378-4290(94)90011-6

10.1023/A:1004397219723

Martin, 1999, Crop Science, 39, 1775, 10.2135/cropsci1999.3961775x

10.1016/S0378-4290(97)00074-9

Moinuddin, 2004, Crop Science, 44, 449, 10.2135/cropsci2004.4490

10.1071/AR00062

Morgan, 1986, Australian Journal of Plant Physiology, 13, 523, 10.1071/PP9860523

10.1071/AR9860449

10.1016/0378-4290(91)90022-N

Munoz, 1998, Plant Breeding, 117, 531, 10.1111/j.1439-0523.1998.tb02202.x

Norwood, 1999, South African Journal of Botany, 65, 421, 10.1016/S0254-6299(15)31033-4

Paleg, 1981, Australian Journal of Plant Physiology, 8, 107

Palta, 1994, Crop Science, 34, 118, 10.2135/cropsci1994.0011183X003400010021x

Pheloung, 1991, Australian Journal of Plant Physiology, 18, 53, 10.1071/PP9910053

10.1016/j.fcr.2003.08.005

10.1016/0098-8472(94)90050-7

10.1071/AR9890943

Riga, 1999, Australian Journal of Plant Physiology, 26, 211, 10.1071/PP98094

10.1016/0378-4290(92)90072-H

10.1006/mben.2001.0208

10.1023/A:1014894130270

10.1016/S1161-0301(01)00094-6

10.1071/AR9900051

10.1101/gr.157201

Singh, 1985, Annals of Botany, 56, 815

10.1016/S1161-0301(00)00050-2

10.1071/AR9950061

10.1071/AR9910759

10.1007/BF00220925

Teulat, 1997, Plant Breeding, 116, 519, 10.1111/j.1439-0523.1997.tb02183.x

10.1093/jexbot/51.suppl_1.329

10.1016/S0378-3774(02)00157-9

Tuinstra, 1998, Crop Science, 38, 835, 10.2135/cropsci1998.0011183X003800030036x

10.1007/BF00029563

Westgate, 1996, Australian Journal of Plant Physiology, 23, 763, 10.1071/PP9960763

10.1071/AR9830627

10.1006/anbo.1997.0444

Yang, 2002, Agronomy Journal, 94, 102, 10.2134/agronj2002.0102

10.1016/S0378-4290(01)00147-2

10.1104/pp.127.1.315

Zhang, 1997, Tree Physiology, 17, 461, 10.1093/treephys/17.7.461